# ThunderPhone

> ThunderPhone is an AI phone agent platform (voice AI platform / AI calling platform / voice agent API) for reliable AI phone agents. It combines audio understanding, model routing, speech output, telephony, testing, monitoring, and integrations so businesses can automate inbound and outbound calls more accurately and at lower per-minute cost.

## Primary Pages

- [Voice AI that nails the calls others fumble.](https://thunderphone.com/): ThunderPhone is an integrated voice AI stack for reliable, low-cost phone agents that hear callers correctly, follow instructions, and run across phone, web, and app channels.
- [Integrated voice AI architecture](https://thunderphone.com/technology): Explains ThunderPhone audio understanding, model routing, instruction following, benchmark performance, speech-to-speech tradeoffs, and enterprise extensions.
- [The control room for AI calls.](https://thunderphone.com/platform): Shows the ThunderPhone platform for building agents, choosing voices and intelligence tiers, connecting SIP and integrations, running tests, and monitoring production calls.
- [Simple per-minute pricing](https://thunderphone.com/pricing): Details Spark, Bolt, and Storm pricing, surcharges, premium voices, language support, and comparisons against human call centers and other voice AI platforms.
- [Enterprise voice AI implementation](https://thunderphone.com/enterprise): Describes enterprise deployments, implementation support, custom integrations, data residency, compliance, ThunderHuman, interpreting, and high-volume optimization.
- [White-label AI interpreting for LSPs](https://thunderphone.com/interpreting): Describes ThunderPhone Interpreting, the white-label over-the-phone interpreting platform for LSPs: dedicated numbers per language pair, the TranslateMyCall public demo line, language coverage, per-minute economics, and compliance options.
- [Bring your agents to ThunderPhone](https://thunderphone.com/import): Explains the ThunderPhone agent importer for Vapi, Retell, ElevenLabs Agents, and Bland: what is fetched, how prompts, voices, tools, and knowledge are mapped, what needs a manual step, and how the vendor key is handled.
- [Build phone agents from your coding agent.](https://thunderphone.com/developers): Developer entrypoint for ThunderPhone skills, API and docs MCP servers, OpenAPI, machine-readable docs, and the REST API quickstart.
- [Generations of voice AI](https://thunderphone.com/generations-of-voice-ai): Explains the evolution from brittle phone trees and scripted bots to integrated voice AI systems that can understand audio and follow instructions.
- [Security & Compliance](https://thunderphone.com/security): ThunderPhone HIPAA and GDPR compliance posture, security controls, active policies, and vendor BAA status.
- [Changelog](https://thunderphone.com/changelog): Dated release notes for the ThunderPhone platform, going back to October 2025.

## Key Facts

- ThunderPhone API MCP server: https://thunderphone.com/docs/guides/thunderphone-mcp-server (endpoint: https://api.thunderphone.com/v1/mcp).
- Read-only documentation MCP server: https://thunderphone.com/docs/mcp.
- Install the ThunderPhone coding-agent skills with `npx skills add thunderphone/skills`.
- OpenAPI schema: https://thunderphone.com/docs/openapi.json.
- [Developer resources](https://thunderphone.com/developers): coding-agent setup, MCP, skills, and an API quickstart.
- [ThunderPhone for coding agents](https://thunderphone.com/docs/guides/coding-agents): agent-first setup guidance.
- Pricing (published, pay as you go, no subscription, seat, or platform fee): Spark 2¢/minute, Bolt 5¢/minute, Storm 9¢/minute. Each rate includes speech recognition, the language model, and the voice.
- Published add-ons: selected premium voice or language paths up to +3¢/minute (non-stacking); ThunderPhone numbers +1¢/minute plus $1/month per number (real US numbers, usable in production, inbound-only); prompts beyond the first 5,000 tokens +1¢/minute (Spark) or +2¢/minute (Bolt, Storm) per additional 10,000-token block; call supervision +4¢/minute (Spark and Storm); Storm verbal acknowledgement +2¢/minute; Storm extra intelligence +3¢/minute; live caller transcripts +1.5¢/minute (realtime WebSocket API only). Hold time bills a flat 2¢/minute.
- Telephony is not part of the engine rate. Imported VoIP/SIP numbers (Twilio, Telnyx, SignalWire, Vonage, Plivo, any SIP trunk) carry no ThunderPhone import or monthly charge; the carrier bills its own usage.
- Calls are metered in quarter-minute increments (0.25-minute minimum).
- Enterprise pricing for high-volume workloads is available at 1¢/minute or less.
- 47 languages and 123 voices; 15 languages included, 32 premium.
- Uses multiple transcription paths plus direct audio-to-LLM input to reduce caller-understanding errors; Storm combines thinking and non-thinking model paths.
- Supports real telephony, SIP, web widgets, a REST API and realtime WebSocket API, and webhooks.
- Native outbound campaigns run from the dashboard or API: CSV uploads of up to 5,000 contacts, per-contact variables, scheduled launches, timezone-based calling windows, pacing, retries, and live progress. [Campaign guide](https://thunderphone.com/docs/guides/outbound-campaigns) · [Campaigns API](https://thunderphone.com/docs/api-reference/campaigns).
- ThunderHuman is a separate optional cold-outreach service with human agents guided by AI. [Enterprise services](https://thunderphone.com/enterprise).
- ThunderPhone responds in 2–3 seconds on real calls. [Technology](https://thunderphone.com/technology) explains how Storm combines fast and thinking models for stronger audio understanding and instruction following within that response window.
- Includes agent setup, test calls, simulations, regression suites, monitoring, issue detection, integrations, and reporting.
- GDPR and HIPAA compliant (BAA/DPA available); enterprise options include custom deployments, data residency, ThunderSocket, ThunderHuman, and high-volume optimization.
- Pricing facts above were verified on 2026-09-10; canonical source: https://thunderphone.com/pricing and https://thunderphone.com/guides/thunderphone-pricing.

## Voice AI Price Index

- [Voice AI Price Index](https://thunderphone.com/guides/voice-ai-price-index): dated per-minute list prices for managed voice AI platforms, what each headline rate includes, and a computable complete floor.
- [Price index data (JSON)](https://thunderphone.com/data/voice-ai-price-index.json) · [CSV](https://thunderphone.com/data/voice-ai-price-index.csv)

## Solutions

- [Industries](https://thunderphone.com/industries)
- [Compare](https://thunderphone.com/compare)
- [Alternatives](https://thunderphone.com/alternatives)
- [Guides](https://thunderphone.com/guides)
- [Languages](https://thunderphone.com/languages)
- [Glossary](https://thunderphone.com/glossary)
- [Use cases](https://thunderphone.com/use-cases)
- [Integrations](https://thunderphone.com/integrations)

### Industries

- [AI Phone Agents for Accounting Firms](https://thunderphone.com/ai-phone-agents-for-accounting-firms): Capture new-client inquiries, schedule consultations, survive the tax-season ring storm, and run document and deadline reminder campaigns — without the agent ever giving tax advice.
- [AI Phone Agents for Auto Repair Shops and Service Departments](https://thunderphone.com/ai-phone-agents-for-auto-services): Book service appointments, run status and ready-for-pickup calls, relay estimates for approval, and capture breakdown calls with a multilingual AI phone agent.
- [AI Phone Agents for Car Dealerships](https://thunderphone.com/ai-phone-agents-for-car-dealerships): Answer inventory calls, book test drives, call internet leads back in minutes, and capture trade-in details with a multilingual AI phone agent for dealership sales and BDC teams.
- [AI Phone Agents for Childcare Centers](https://thunderphone.com/ai-phone-agents-for-childcare-centers): Answer parent calls, capture enrollment inquiries, schedule tours, take absence reports, and route sensitive questions to staff with a multilingual AI phone agent.
- [AI Phone Agents for Cleaning Services](https://thunderphone.com/ai-phone-agents-for-cleaning-services): Answer cleaning-company calls, capture new-lead details, book estimates and recurring visits, and route complaints with a multilingual AI phone agent.
- [AI Phone Agents for Dental Offices](https://thunderphone.com/ai-phone-agents-for-dental-offices): Answer dental calls, book appointments, handle routine questions, and route urgent patients with a multilingual AI phone agent.
- [AI Phone Agents for Dermatology Practices](https://thunderphone.com/ai-phone-agents-for-dermatology): Fill cancelled slots from the waitlist, capture referrals, run urgent-lesion scripts, schedule biopsy-result callbacks, and handle recall outreach for annual skin checks with a multilingual AI phone agent.
- [AI Phone Agents for Driving Schools](https://thunderphone.com/ai-phone-agents-for-driving-schools): Answer enrollment calls, book and reschedule lessons, explain packages, and handle parent questions with a multilingual AI phone agent for driving schools.
- [AI Phone Agents for E-commerce](https://thunderphone.com/ai-phone-agents-for-ecommerce): Answer order-status calls from connected order data, start returns per your policy, handle product and shipping questions, and support customers in 47 languages.
- [AI Phone Agents for Tutoring Centers](https://thunderphone.com/ai-phone-agents-for-tutoring-centers): Answer parent calls, capture enrollment inquiries, schedule assessments and make-up sessions, and route questions to instructors with a multilingual AI phone agent.
- [AI Phone Agents for Equipment Rental](https://thunderphone.com/ai-phone-agents-for-equipment-rental): Answer availability calls, take reservations, schedule deliveries and off-rents, and escalate breakdowns to dispatch with a multilingual AI phone agent.
- [AI Phone Agents for Event Venues](https://thunderphone.com/ai-phone-agents-for-event-venues): Qualify event inquiries, schedule tours, check date availability, coordinate vendors, and call consented web leads back automatically with a multilingual AI phone agent.
- [AI Phone Agents for Financial Advisors](https://thunderphone.com/ai-phone-agents-for-financial-advisors): Capture prospect calls, schedule and confirm client meetings, take structured service requests, and run event RSVPs with an AI phone agent that never gives investment advice.
- [AI Phone Agents for Funeral Homes](https://thunderphone.com/ai-phone-agents-for-funeral-homes): Every call answered by a calm, unhurried voice at any hour — first calls gathered gently and handed to the on-call director, routine questions answered from the home's own words.
- [AI Phone Agents for Golf Courses](https://thunderphone.com/ai-phone-agents-for-golf-courses): Answer tee-time calls, book through your connected tee sheet, capture outing and membership inquiries, and handle frost-delay mornings with a multilingual AI phone agent.
- [AI Phone Agents for Gyms and Fitness Studios](https://thunderphone.com/ai-phone-agents-for-gyms-and-fitness-studios): Answer membership calls, book tours and classes, follow up on web leads, and route freeze or billing requests with a multilingual AI phone agent.
- [AI Phone Agents for Home Health Care](https://thunderphone.com/ai-phone-agents-for-home-health-care): Capture referrals on the first ring, handle caregiver call-outs, confirm visits, and route urgent calls by agency-defined rules with a multilingual AI phone agent.
- [AI Phone Agents for Home Service Businesses](https://thunderphone.com/ai-phone-agents-for-home-services): Answer service calls, qualify jobs, schedule visits, capture after-hours leads, and transfer urgent work with an AI phone agent.
- [AI Phone Agents for Hotels & Hospitality](https://thunderphone.com/ai-phone-agents-for-hotels): Answer reservation calls, route guest requests, confirm arrivals, and serve international guests in 47 languages with an AI phone agent for hotels.
- [AI Phone Agents for Insurance Agencies](https://thunderphone.com/ai-phone-agents-for-insurance-agencies): Capture quote requests, take first notice of loss, route policy-service calls, and run renewal outreach with an AI phone agent that always hands licensed work to licensed staff.
- [AI Phone Agents for IT Services and MSPs](https://thunderphone.com/ai-phone-agents-for-it-services): Answer help-desk calls, triage severity by your written rules, create structured tickets, page on-call engineers, and keep clients informed with an AI phone agent.
- [AI Phone Agents for Law Firms](https://thunderphone.com/ai-phone-agents-for-law-firms): Qualify new inquiries, capture consistent intake details, route urgent matters, and answer routine calls without turning legal intake into a phone queue.
- [AI Phone Agents for Locksmiths](https://thunderphone.com/ai-phone-agents-for-locksmiths): Answer lockout calls while you're on a job, capture location and vehicle details, quote only your configured prices, and dispatch urgent work with a multilingual AI phone agent.
- [AI Phone Agents for Logistics, Freight Brokerages, and 3PLs](https://thunderphone.com/ai-phone-agents-for-logistics): Run carrier check calls at scale, answer shipper status inquiries, intake detention and lumper reports, and hold on warehouse lines with an AI phone agent.
- [AI Phone Agents for Med Spas](https://thunderphone.com/ai-phone-agents-for-med-spas): Book consultations by treatment type, run intake with your screening questions, confirm appointments, fill cancellations, and check in after treatments with a multilingual AI phone agent.
- [AI Phone Agents for Medical Clinics](https://thunderphone.com/ai-phone-agents-for-medical-clinics): Answer patient calls, schedule visits, take refill requests, run reminder and recall outreach, and escalate urgent callers by clinic-defined rules with a multilingual AI phone agent.
- [AI Phone Agents for Mortgage Brokers](https://thunderphone.com/ai-phone-agents-for-mortgage-brokers): Capture mortgage inquiries, schedule loan-officer calls, send document reminders, and route application-status questions with a multilingual AI phone agent.
- [AI Phone Agents for Moving Companies](https://thunderphone.com/ai-phone-agents-for-moving-companies): Capture quote requests, schedule surveys, confirm bookings, coordinate move day, and handle claims intake with an AI phone agent for movers and storage companies.
- [AI Phone Agents for Optometrists](https://thunderphone.com/ai-phone-agents-for-optometrists): Answer eye-care calls, book exams, handle glasses and contact-lens order questions, and route urgent symptoms with a multilingual AI phone agent.
- [AI Phone Agents for Pest Control Companies](https://thunderphone.com/ai-phone-agents-for-pest-control): Answer after-hours pest calls, qualify new jobs, book inspections, manage recurring visits, and cover seasonal surges with a multilingual AI phone agent.
- [AI Phone Agents for Pharmacies](https://thunderphone.com/ai-phone-agents-for-pharmacies): Take refill requests, place prescription-ready and pickup-reminder calls, answer hours and insurance questions, and route every medication question to the pharmacist with a multilingual AI phone agent.
- [AI Phone Agents for Physical Therapy Clinics](https://thunderphone.com/ai-phone-agents-for-physical-therapy): Book evaluations and visit series, run plan-of-care and intake-form reminders, backfill cancellations from the waitlist, collect workers'-comp intake fields, and route clinical questions to clinicians with a multilingual AI phone agent.
- [AI Phone Agents for Property Management](https://thunderphone.com/ai-phone-agents-for-property-management): Route maintenance requests, answer resident questions, follow up on work orders, and escalate property emergencies with an AI phone agent.
- [AI Phone Agents for Property Restoration](https://thunderphone.com/ai-phone-agents-for-property-restoration): Answer emergency loss calls 24/7, capture structured intake, escalate to on-call technicians, and route adjuster calls with a multilingual AI phone agent.
- [AI Phone Agents for Real Estate](https://thunderphone.com/ai-phone-agents-for-real-estate): Answer sign calls and listing inquiries, schedule showings, call back web leads in minutes, and run consent-based outreach for real estate brokerages, teams, and agents.
- [AI Phone Agents for Restaurants](https://thunderphone.com/ai-phone-agents-for-restaurants): Answer reservation calls, quote wait policies, capture takeout and event inquiries, and confirm bookings with a multilingual AI phone agent.
- [AI Phone Agents for Salons and Spas](https://thunderphone.com/ai-phone-agents-for-salons-and-spas): Book appointments by service and provider, fill cancellations from the waitlist, confirm tomorrow's schedule, and answer menu questions with a multilingual AI phone agent.
- [AI Phone Agents for Self-Storage](https://thunderphone.com/ai-phone-agents-for-self-storage): Answer unit-availability and sizing questions, take rental inquiries, schedule move-ins, and handle gate-access calls with an AI phone agent.
- [AI Phone Agents for Senior Living Communities](https://thunderphone.com/ai-phone-agents-for-senior-living): Answer family inquiries warmly, schedule tours, support admissions intake, and route resident-family calls to staff with a multilingual AI phone agent for independent living, assisted living, and memory care.
- [AI Phone Agents for Solar Installers](https://thunderphone.com/ai-phone-agents-for-solar-installers): Answer solar leads while crews are on roofs, qualify inquiries, schedule site surveys, give project-status updates, and handle service calls with a multilingual AI phone agent.
- [AI Phone Agents for Staffing and Recruiting Agencies](https://thunderphone.com/ai-phone-agents-for-staffing-agencies): Capture applications, ask the agency's own screening questions, fill open shifts by calling the available-worker list, and keep placed workers confirmed—without making a single hiring judgment.
- [AI Phone Agents for Therapy Practices](https://thunderphone.com/ai-phone-agents-for-therapy-practices): Answer new-client inquiries, manage waitlists and scheduling, route insurance and superbill questions, and capture after-hours messages for a counseling practice — with a practice-configured crisis response placed first in the intended call flow.
- [AI Phone Agents for Towing Companies](https://thunderphone.com/ai-phone-agents-for-towing-companies): Answer stranded callers 24/7, capture dispatch-ready location and vehicle details, handle impound-release questions, and route unsafe situations with a multilingual AI phone agent.
- [AI Phone Agents for Travel Agencies](https://thunderphone.com/ai-phone-agents-for-travel-agencies): Qualify trip inquiries, schedule advisor consultations, run payment and pre-departure reminder calls, and cover after-hours in 47 languages with an AI phone agent.
- [AI Phone Agents for Veterinary Clinics](https://thunderphone.com/ai-phone-agents-for-veterinary-clinics): Answer veterinary calls, book appointments, take refill requests, run reminder campaigns, and route emergencies with a multilingual AI phone agent.

### Comparisons, Alternatives, Guides & Integrations

- [Voice AI language support compared: ThunderPhone vs. Retell vs. Vapi vs. Bland](https://thunderphone.com/compare/voice-ai-language-support): How ThunderPhone, Retell AI, Vapi, and Bland AI actually count supported languages — published catalogs, provider ceilings, switching behavior, and a buyer checklist, verified August 2026.
- [How to compare voice AI performance — and what ThunderPhone publishes](https://thunderphone.com/compare/voice-ai-performance): Why voice AI performance claims are hard to compare, what ThunderPhone publishes and lets you audit, and how to run your own apples-to-apples evaluation.
- [Phonely vs. Bland AI: subscriptions versus bundled minute pricing](https://thunderphone.com/compare/phonely-vs-bland): Compare Phonely and Bland AI on published pricing, telephony, languages, compliance, and testing, with a normalized 10,000-minute workload, verified September 2026.
- [Voice AI platform features compared: testing, monitoring, telephony, and integrations — ThunderPhone vs. Retell vs. Vapi vs. Bland](https://thunderphone.com/compare/voice-ai-platform-features): A feature-by-feature comparison of ThunderPhone, Retell AI, Vapi, and Bland AI across testing, monitoring, telephony, call handling, and integrations, verified against public sources as of August 2026.
- [Voice AI pricing compared (2026): ThunderPhone vs. Retell vs. Vapi vs. Bland per-minute costs](https://thunderphone.com/compare/voice-ai-pricing): Compare voice AI pricing models, from ThunderPhone’s 2¢/min engine to component bills and tiered bundles, with worked costs, verified September 2026.
- [Retell vs. Vapi vs. Bland vs. ElevenLabs (2026): pricing, languages, and compliance compared](https://thunderphone.com/compare/retell-vs-vapi-vs-bland-vs-elevenlabs): A side-by-side roundup of Retell AI, Vapi, Bland AI, and ElevenLabs Agents — pricing models, languages, telephony, compliance, and testing — with a normalized 10,000-minute scenario, verified August 2026.
- [Retell AI vs. Vapi: component pricing and provider control](https://thunderphone.com/compare/retell-vs-vapi): A Vapi vs Retell pricing comparison covering provider control, telephony, compliance, languages, and testing, with a normalized workload, verified September 2026.
- [Smith.ai vs. Goodcall: an AI receptionist comparison](https://thunderphone.com/compare/smith-ai-vs-goodcall): A side-by-side look at Smith.ai's hybrid AI-plus-human receptionist and Goodcall's flat-rate AI phone agent — pricing units, features, and compliance postures — with a pay-per-minute platform alternative, verified September 2026.
- [Synthflow vs. Vapi: enterprise contract versus self-serve infrastructure](https://thunderphone.com/compare/synthflow-vs-vapi): Compare Synthflow and Vapi on published pricing, buying model, telephony, compliance, testing, and cost transparency, verified September 2026.
- [ThunderPhone vs. Bland AI: pricing, deployment, compliance, and testing](https://thunderphone.com/compare/thunderphone-vs-bland): Compare verified ThunderPhone and Bland AI pricing, language coverage, SIP options, compliance posture, and testing tooling as of August 2026.
- [ThunderPhone vs. building your own AI phone agent: the build-vs-buy decision](https://thunderphone.com/compare/thunderphone-vs-building-your-own): What rolling your own voice agent on LiveKit Agents or Pipecat actually requires — providers, telephony, hosting, testing, maintenance — versus ThunderPhone's published 2¢/5¢/9¢ per-minute rates, as of August 2026.
- [ThunderPhone vs. ElevenLabs Agents: pricing, telephony, compliance, and testing](https://thunderphone.com/compare/thunderphone-vs-elevenlabs): Compare verified ThunderPhone and ElevenLabs Agents pricing, language coverage, SIP options, compliance posture, and testing tooling as of August 2026.
- [ThunderPhone vs. Goodcall: pricing, phone numbers, languages, and compliance](https://thunderphone.com/compare/thunderphone-vs-goodcall): Compare ThunderPhone and Goodcall pricing units, phone-number options, languages, workflows, integrations, compliance posture, and testing depth for buyers.
- [ThunderPhone vs. LiveKit Cloud (2026): pricing, telephony, and what each side manages](https://thunderphone.com/compare/thunderphone-vs-livekit): Compare ThunderPhone's hosted phone-agent platform with LiveKit Cloud running LiveKit Agents: pricing, telephony, compliance, testing, and what each side manages, verified August 2026.
- [ThunderPhone vs. Phonely: pricing, telephony, compliance, and testing](https://thunderphone.com/compare/thunderphone-vs-phonely): Compare verified ThunderPhone and Phonely pricing, tier limits, language coverage, SIP options, compliance posture, and testing tooling as of August 2026.
- [ThunderPhone vs. Pipecat Cloud (2026): pricing, hosting, and what each side manages](https://thunderphone.com/compare/thunderphone-vs-pipecat): Compare ThunderPhone's hosted phone-agent platform with Pipecat Cloud's managed hosting for Pipecat agents — pricing structure, telephony, compliance, and testing, verified August 2026.
- [ThunderPhone vs. Plivo Voice AI: pricing, telephony, and what each headline rate includes](https://thunderphone.com/compare/thunderphone-vs-plivo): Compare ThunderPhone Spark at 2¢/min with Plivo Voice AI at 3¢/min, plus telephony, SIP routing, and worked monthly costs; verified September 2026.
- [ThunderPhone vs. Retell AI: pricing, telephony, compliance, and testing](https://thunderphone.com/compare/thunderphone-vs-retell): Compare verified ThunderPhone and Retell AI pricing, language coverage, SIP options, compliance posture, and testing tooling as of August 2026.
- [ThunderPhone vs. Smith.ai: pricing, human backup, telephony, and compliance](https://thunderphone.com/compare/thunderphone-vs-smith-ai): Compare ThunderPhone and Smith.ai pricing units, live human backup, telephony, languages, compliance posture, integrations, and testing workflows.
- [ThunderPhone vs. Telnyx Voice AI Agents: the $0.05 rate, LLM tokens, telephony, and a 10,000-minute example](https://thunderphone.com/compare/thunderphone-vs-telnyx): Compare Telnyx's $0.05 voice engine with ThunderPhone Spark, including LLM tokens, telephony, and a 10,000-minute example; verified September 2026.
- [ThunderPhone vs. Thoughtly: pricing, GTM workflows, telephony, and compliance](https://thunderphone.com/compare/thunderphone-vs-thoughtly): Compare ThunderPhone and Thoughtly pricing transparency, GTM workflows, telephony, languages, APIs, testing, integrations, and compliance posture for buyers.
- [ThunderPhone vs. Vapi: pricing, languages, SIP, compliance, and testing](https://thunderphone.com/compare/thunderphone-vs-vapi): Compare verified ThunderPhone and Vapi pricing, language coverage, SIP options, compliance posture, and testing tooling as of August 2026.
- [Air AI alternatives (2026): working AI phone-call platforms compared](https://thunderphone.com/alternatives/air-ai): Air AI settled an FTC action in March 2026 and its domain now serves an unrelated company. Verified, sourced alternatives for AI phone agents: ThunderPhone, Retell, Vapi, and Bland.
- [Bland AI alternatives (2026): verified pricing and platform comparison](https://thunderphone.com/alternatives/bland): Five Bland AI alternatives for AI phone agents, compared on verified published pricing, tier limits, compliance posture, and telephony options as of August 2026.
- [ElevenLabs Agents alternatives (2026): five platforms compared on published pricing and docs](https://thunderphone.com/alternatives/elevenlabs-agents): A sourced look at ElevenLabs conversational AI alternatives — ThunderPhone, Retell AI, Vapi, Bland AI, and Phonely — compared on published pricing, telephony, compliance, and testing.
- [Goodcall alternatives (2026): compare pricing, phone setup, and platform control](https://thunderphone.com/alternatives/goodcall): Compare Goodcall alternatives across caller-based pricing, phone setup, languages, integrations, compliance posture, testing tools, and buyer fit.
- [Phonely alternatives (2026): five platforms compared on published pricing and docs](https://thunderphone.com/alternatives/phonely): A sourced look at Phonely alternatives — ThunderPhone, Retell AI, Vapi, Bland AI, and ElevenLabs Agents — compared on published pricing, tier limits, telephony, compliance, and testing.
- [Retell AI alternatives (2026): five platforms compared on published pricing and docs](https://thunderphone.com/alternatives/retell): A sourced look at Retell AI alternatives — ThunderPhone, Vapi, Bland AI, ElevenLabs Agents, and Phonely — compared on published pricing, telephony, compliance, and testing.
- [Smith.ai alternatives (2026): AI receptionists compared on pricing, human backup, and platform depth](https://thunderphone.com/alternatives/smith-ai): Compare Smith.ai alternatives across pricing, human backup, telephony, languages, integrations, compliance posture, testing depth, and buyer fit.
- [Synthflow alternatives for self-serve voice AI buyers (2026)](https://thunderphone.com/alternatives/synthflow): Synthflow's public pricing now starts at $30,000/year with no self-serve tiers. Verified self-serve alternatives: ThunderPhone, Retell, Vapi, Bland, and Phonely.
- [Thoughtly alternatives (2026): compare pricing, channels, CRM depth, and testing](https://thunderphone.com/alternatives/thoughtly): Compare Thoughtly alternatives for pricing transparency, channels, CRM workflows, telephony, languages, compliance posture, testing depth, and buyer fit.
- [Vapi alternatives (2026): 5 voice-agent platforms compared on pricing, compliance, and testing](https://thunderphone.com/alternatives/vapi): A sourced look at ThunderPhone, Retell, Bland, ElevenLabs Agents, and Phonely as Vapi alternatives, with published pricing and compliance facts as of August 2026.
- [Voice AI Agent-Readiness Index: MCP, skills, docs, SDKs and CLIs](https://thunderphone.com/guides/agent-readiness-index): Compare eight voice AI vendors on coding-agent access, with a source and checked-on date for every capability. Download the JSON or CSV.
- [AI call quality assurance: grade every call, then verify the grader](https://thunderphone.com/guides/ai-call-quality-assurance): QA for AI phone agents — why grading every call beats sampling, how automatic issue detection clusters failures into patterns, what makes a rubric work, and where LLM-judged QA needs humans in the loop.
- [How much does an AI phone agent cost in 2026? The five pricing models, explained](https://thunderphone.com/guides/ai-phone-agent-cost): A buyer's guide to AI phone agent pricing — all-in per-minute, component-based, hosting plus pass-through, bundled tiers, and per-agent or per-call plans — with a worked 10,000-minute month and a TCO checklist, verified August 2026.
- [AI virtual receptionist: a buyer's guide to cost, setup, and call handling](https://thunderphone.com/guides/ai-virtual-receptionist): Compare AI and human virtual receptionist models by billing unit, call coverage, handoff, phone setup, testing, and compliance considerations.
- [Audio codecs on phone calls: G.711, G.722, and Opus, explained](https://thunderphone.com/guides/audio-codecs-explained): Phone-call codecs turn sampled speech into transportable bits; G.711 favors simplicity, G.722 wider speech bandwidth, and Opus adaptive efficiency.
- [Best AI answering service: nine options for 24/7 and overflow calls](https://thunderphone.com/guides/best-ai-answering-service): Compare nine AI answering services for after-hours coverage, overflow, routing, human backup, phone setup, fit, and published pricing as of August 2026.
- [Best AI receptionist software: nine options compared for 2026](https://thunderphone.com/guides/best-ai-receptionist-software): Compare nine AI receptionist options for buyers by service model, published pricing, phone setup, testing, languages, and human backup as of August 2026.
- [Bland AI pricing (2026): per-minute tiers, platform fees, and what 10,000 minutes costs](https://thunderphone.com/guides/bland-pricing): Bland AI pricing: Start at $0.14/min, Build at $0.12/min plus $299/month, transfer fees, limits, and a 10,000-minute example, verified September 2026.
- [Where the milliseconds go: latency in AI phone calls](https://thunderphone.com/guides/call-latency-explained): AI call latency is the accumulated time for capture, transport, turn detection, recognition, response generation, speech synthesis, and playback.
- [Cartesia Line pricing (2026): per-minute costs, plan limits, and a worked example](https://thunderphone.com/guides/cartesia-line-pricing): Cartesia Line starts at $0.074/min with a Cartesia number and temporary free LLM usage. Compare plan limits and monthly costs, verified September 2026.
- [The cheapest AI receptionist in 2026: subscriptions, per-call plans, and usage pricing compared](https://thunderphone.com/guides/cheapest-ai-receptionist): What an AI receptionist costs across pricing models, with a worked 300-call small-business month — verified September 2026.
- [The cheapest AI voice agent in 2026: published per-minute prices, compared](https://thunderphone.com/guides/cheapest-ai-voice-agent): Compare 2¢/min ThunderPhone Spark with published AI voice agent prices, carrier costs, and a worked monthly call workload, verified September 2026.
- [Client portals for AI call reporting: white-label visibility without dashboard access](https://thunderphone.com/guides/client-portals-for-ai-call-reporting): How agencies and service providers running AI phone agents for many clients use white-label client reporting portals — what a portal shows and hides, branding, viewer access models, read-only scope discipline, and consent inheritance.
- [Deepgram Voice Agent API pricing (2026): rates, telephony, and the September changeover](https://thunderphone.com/guides/deepgram-voice-agent-pricing): Deepgram Standard costs $0.056/min through September 12, then $0.075/min. See Twilio costs and a 10,000-minute example, verified September 2026.
- [ElevenLabs Agents pricing (2026): tiers, the $0.08/minute overage, and what is billed on top](https://thunderphone.com/guides/elevenlabs-agents-pricing): How ElevenLabs conversational AI pricing works — subscription tiers with included call minutes, the flat $0.08/minute overage, burst pricing, and the LLM and telephony costs billed separately on top — verified August 2026.
- [Free AI phone agents in 2026: real free tiers, trial credits, and what they include](https://thunderphone.com/guides/free-ai-phone-agent): Which voice-AI platforms have a genuine free tier versus trial credits, what each includes, and what the price becomes afterward, verified September 2026.
- [Choosing a GDPR-compliant AI phone agent: a buyer's guide](https://thunderphone.com/guides/gdpr-compliant-ai-phone-agent): What GDPR means for AI phone agents — recordings, transcripts, controller and processor roles — plus what to look for in a platform and how major vendors publicly describe their GDPR posture.
- [Goodcall pricing (2026): per-agent plans, what counts as a unique customer, and a worked example](https://thunderphone.com/guides/goodcall-pricing): Goodcall's $79/$129/$249 per-agent plans, the unique-customer meter, the $0.50 overage, and a worked example with the arithmetic shown; verified September 2026.
- [HD voice, explained: what it is and when calls actually get it](https://thunderphone.com/guides/hd-voice-explained): HD voice is wideband calling that preserves more speech frequencies, but callers hear it only when the negotiated path stays wideband end to end.
- [HIPAA compliant AI phone agents: what the label means and how to evaluate one](https://thunderphone.com/guides/hipaa-compliant-ai-phone-agent): A buyer's guide to HIPAA and AI phone agents: why voice AI touches PHI, what a BAA does and does not cover, how ThunderPhone and other platforms describe their posture, and an evaluation checklist for healthcare teams.
- [How AI phone agents work: the full pipeline, explained](https://thunderphone.com/guides/how-ai-phone-agents-work): An AI phone agent is a real-time speech system that connects telephony, transcription, dialogue logic, tools, and synthesized audio in one call.
- [How call transfers actually work: SIP REFER, bridging, warm and cold](https://thunderphone.com/guides/how-call-transfers-work): Call transfers either redirect a SIP dialog or create and bridge a second call leg, with different behavior for consultation, failure, media, and control.
- [Caller ID, CNAM, and why calls get labeled "Spam Likely"](https://thunderphone.com/guides/how-caller-id-and-spam-labeling-work): Caller ID combines a calling number, optional name data, cryptographic verification, and carrier reputation systems that can independently change the display.
- [How voice agents take actions mid-call: function calling, explained](https://thunderphone.com/guides/how-function-calling-works-on-live-calls): Function calling lets a voice agent request a typed operation during a call while an application validates, executes, and returns the result for speech.
- [How voice agents ground answers: knowledge bases and RAG on calls](https://thunderphone.com/guides/how-knowledge-grounding-works): Voice agents ground answers by retrieving relevant approved passages for each turn, then constraining the response to that evidence and call context.
- [How number porting works: LOAs, FOC dates, and timelines](https://thunderphone.com/guides/how-number-porting-works): Number porting moves a phone number between carriers through authorization, record validation, an accepted order, and a coordinated routing cutover.
- [How a phone call works: from dial to audio, PSTN to VoIP](https://thunderphone.com/guides/how-phone-calls-work): A phone call uses signaling to resolve a dialed number and establish a session, then carries audio over circuit or packet paths until teardown.
- [How SIP trunking works](https://thunderphone.com/guides/how-sip-trunking-works): A SIP trunk is an IP connection that uses signaling to establish phone sessions and negotiated media streams to carry calls between systems.
- [How speech recognition works on phone calls](https://thunderphone.com/guides/how-speech-recognition-works-on-calls): Call speech recognition turns a compressed audio stream into evolving text by extracting acoustic features, decoding tokens, and finalizing stable words.
- [How text-to-speech works in real-time calls](https://thunderphone.com/guides/how-text-to-speech-works): Real-time text-to-speech normalizes response text, predicts pronunciation and prosody, generates a waveform, and streams encoded audio into the call.
- [How to cut your voice AI bill: nine levers that actually move the per-minute price](https://thunderphone.com/guides/how-to-reduce-voice-ai-costs): Practical cost levers — comparing complete rates, call-length discipline, prompt size, tier routing, hold and voicemail policy, transfer strategy, concurrency, telephony, and testing budgets — verified September 2026.
- [How to test a voice agent before it answers real calls](https://thunderphone.com/guides/how-to-test-voice-agents): Voice-agent testing must cover conversation policy, audio and turn timing, tool side effects, telephony, integrations, and safe recovery together.
- [How voicemail and answering machine detection works](https://thunderphone.com/guides/how-voicemail-detection-works): Voicemail detection classifies post-answer audio from speech, silence, cadence, and tones, then waits for a safe point to leave a message or hang up.
- [How webhooks carry call events to your systems](https://thunderphone.com/guides/how-webhooks-work-for-calls): Call webhooks are signed HTTP callbacks that report lifecycle events, while retries and receiver-side deduplication bridge calls to business systems.
- [How browser calls work: WebRTC from mic to phone network](https://thunderphone.com/guides/how-webrtc-browser-calls-work): A browser call captures microphone audio, secures and transports it with WebRTC, then crosses a media gateway when it must reach the phone network.
- [Live call monitoring for AI voice agents: listen, whisper, step in](https://thunderphone.com/guides/live-call-monitoring): How live oversight of AI phone calls works — silent listen-in, private whisper guidance the caller never hears, joining and escalation — and when it beats after-the-fact review.
- [How to migrate from Bland to ThunderPhone (2026): import agents, tools, and pathways](https://thunderphone.com/guides/migrate-from-bland-to-thunderphone): Step-by-step: get a Bland API key, run the ThunderPhone importer, review mapped agents and pathways, and finish numbers and credentials.
- [How to migrate from ElevenLabs Agents to ThunderPhone (2026): import agents, tools, and knowledge bases](https://thunderphone.com/guides/migrate-from-elevenlabs-agents-to-thunderphone): Step-by-step: get an ElevenLabs API key, run the ThunderPhone importer, review mapped content, and finish numbers, tools, and credentials.
- [How to migrate from Retell to ThunderPhone (2026): import agents, tools, and knowledge bases](https://thunderphone.com/guides/migrate-from-retell-to-thunderphone): Step-by-step: get a Retell API key, run the ThunderPhone importer, review mapped content, and finish numbers, webhooks, and credentials.
- [How to migrate from Vapi to ThunderPhone (2026): import assistants, tools, and knowledge bases](https://thunderphone.com/guides/migrate-from-vapi-to-thunderphone): Step-by-step: get a Vapi private key, run the ThunderPhone importer, review mapped content, and finish numbers, webhooks, and credentials.
- [The most accurate voice AI: what's actually measurable, and the one auditable number](https://thunderphone.com/guides/most-accurate-voice-ai): Why 'most accurate' has no standardized answer, how WER differs from task accuracy, the auditable 99.4% Big Bench Audio result, and how to run your own evaluation — September 2026.
- [The most reliable voice AI: six things you can actually verify before you buy](https://thunderphone.com/guides/most-reliable-voice-ai): No standardized reliability ranking exists for voice AI — here are the verifiable signals: public status history, automated failure detection, regression testing, live supervision, alerting, and delivery guarantees — September 2026.
- [How multilingual voice agents switch languages mid-call](https://thunderphone.com/guides/multilingual-voice-ai-explained): Multilingual voice agents detect a caller's language from streaming speech, update a controlled language state, and answer with matching recognition and speech.
- [Phonely pricing (2026): tiers, included minutes, overage rates, and a 10,000-minute example](https://thunderphone.com/guides/phonely-pricing): How Phonely's subscription pricing works — the free 100 minutes, $50 Starter and $150 Pro tiers, annual discounts, per-minute overage rates, and a worked 10,000-minute example — verified September 2026.
- [Pipecat Cloud pricing (2026): agent hosting rates, what's passed through, and a 10,000-minute example](https://thunderphone.com/guides/pipecat-cloud-pricing): Pipecat Cloud hosting and reserved rates, telephony and recording add-ons, what your AI providers bill, and a 10,000-minute example — verified September 2026.
- [Plivo Voice AI pricing (2026): telephony, inclusions, and a 10,000-minute example](https://thunderphone.com/guides/plivo-voice-ai-pricing): Plivo Voice AI costs $0.03/min before telephony. See US call rates, LLM uncertainty, and a 10,000-minute cost example, verified September 2026.
- [Prompt engineering for voice agents: what's different about the phone](https://thunderphone.com/guides/prompt-engineering-for-voice-agents): Voice-agent prompts must control a real-time, interruptible conversation with uncertain transcripts, tool side effects, and no visible interface.
- [Retell AI pricing (2026): per-minute components, add-ons, and a 10,000-minute example](https://thunderphone.com/guides/retell-pricing): How Retell AI's component-based pricing works — the $0.055/minute voice infra base, LLM and voice rates stacked on top, telephony, add-ons, and a worked 10,000-minute example computed entirely from Retell's published numbers — verified August 2026.
- [Smith.ai pricing (2026): AI receptionist per-call rates vs. human receptionist plans, with a worked example](https://thunderphone.com/guides/smith-ai-pricing): Smith.ai's per-call AI receptionist tiers ($0–$800/mo, $3 overage) and $300–$2,100 human plans, with a 2,000-call worked example — verified September 2026.
- [Synthflow pricing (2026): enterprise-only plans, what's published, and how to budget a 10,000-minute month](https://thunderphone.com/guides/synthflow-pricing): Synthflow lists an Enterprise plan from $30,000/year, no per-minute rate: what's public, what to ask sales, and a 10,000-minute budget, verified September 2026.
- [Telnyx voice AI pricing (2026): what the $0.05/minute rate covers and what bills on top](https://thunderphone.com/guides/telnyx-voice-ai-pricing): How Telnyx's voice-AI agent pricing works — the $0.05/minute orchestration+STT+TTS rate, separately billed LLM tokens and telephony, tiers, and a worked example — verified September 2026.
- [Thoughtly pricing (2026): plans, per-minute rates, add-ons, and a 10,000-minute example](https://thunderphone.com/guides/thoughtly-pricing): How Thoughtly's Flex, Scale, and Enterprise plans are priced, what is published versus quoted, and a 10,000-minute worked example — verified September 2026.
- [ThunderPhone pricing (2026): 2¢, 5¢, and 9¢ per-minute engine rates, add-ons, and monthly examples](https://thunderphone.com/guides/thunderphone-pricing): Complete ThunderPhone rates with speech recognition, language model, and voice in one number; pay as you go with no subscription, plus worked examples verified September 2026.
- [How ThunderPhone keeps agents reliable: status, self-detection, and testing like software](https://thunderphone.com/guides/thunderphone-reliability): ThunderPhone's reliability machinery — the public status page, automatic issue detection with AI-drafted fixes, simulations and release gates, validation sets, live supervision, alerts, and signed webhooks — September 2026.
- [Turn-taking, endpointing, and barge-in: how voice agents know when to speak](https://thunderphone.com/guides/turn-taking-and-interruptions-explained): Voice agents coordinate listening and speaking with speech detection, endpoint rules, streaming transcripts, playback state, and interruption handling.
- [Twilio ConversationRelay pricing (2026): voice costs, LLM fees, and a 10,000-minute example](https://thunderphone.com/guides/twilio-conversationrelay-pricing): Twilio ConversationRelay costs $0.07/min plus voice and your LLM. See an inbound cost floor, billing caveats, and worked totals, verified September 2026.
- [Vapi pricing (2026): what the $0.05/minute hosting rate includes and what bills on top](https://thunderphone.com/guides/vapi-pricing): How Vapi's hosting-plus-pass-through pricing works — the Build plan's $0.05/minute call hosting, provider costs billed at cost, compliance add-ons, and why the complete per-minute price can't be computed from the public pages — verified August 2026.
- [Voice agent observability: catching failures that never throw an error](https://thunderphone.com/guides/voice-agent-observability): AI phone agents fail as drifting success rates, not exceptions. A useful observability surface separates failure classes, keeps honest denominators, attributes numbers to agents, and discloses sampling.
- [Voice agent regression testing: catching the behaviors a prompt edit silently changed](https://thunderphone.com/guides/voice-agent-regression-testing): How to build and maintain a regression suite for AI phone agents — scenario design, pass-rate gates, replaying frozen real-call turns versus live simulations, CI integration, and keeping the suite honest as the agent evolves.
- [What a voice AI minute actually costs: component economics from published 2026 prices](https://thunderphone.com/guides/voice-ai-cost-breakdown): STT, LLM, TTS, telephony, and orchestration list prices assembled into a per-minute floor, with the conversion assumptions stated — verified September 2026.
- [Voice AI Price Index (September 2026): published per-minute prices for 15 platforms, what each includes, and a computable floor](https://thunderphone.com/guides/voice-ai-price-index): Voice AI rates from 2¢/min for an engine, verified September 2026. Compare published prices, US inbound floors, platform fees, exclusions, and dated sources.
- [Cal.com](https://thunderphone.com/integrations/cal-com): Connect Cal.com so a ThunderPhone agent can check availability, create or cancel bookings, and handle approved scheduling steps during live phone calls.
- [Google Calendar](https://thunderphone.com/integrations/google-calendar): Connect Google Calendar so a ThunderPhone agent can check availability and create, update, or cancel calendar events during scheduling calls for callers.
- [Google Sheets](https://thunderphone.com/integrations/google-sheets): Connect Google Sheets to ThunderPhone so phone agents can append structured lead details, intake data, and call outcomes to a spreadsheet from live calls.
- [HubSpot](https://thunderphone.com/integrations/hubspot): Connect HubSpot so a ThunderPhone agent can find contacts and companies, create or update contacts, and add confirmed call notes during conversations.
- [LiveKit Agents](https://thunderphone.com/integrations/livekit-agents): Use a ThunderPhone voice agent as the realtime speech-to-speech model of a LiveKit Agents session with livekit-plugins-thunderphone, with LiveKit rooms, SIP and telephony around it.
- [MCP servers](https://thunderphone.com/integrations/mcp-servers): Connect remote MCP servers to ThunderPhone over Streamable HTTP, synchronize their tools, and attach selected capabilities to phone agents during calls.
- [OpenAI Realtime API clients](https://thunderphone.com/integrations/openai-realtime-api): Point any OpenAI Realtime API client at ThunderPhone's realtime WebSocket and get a phone agent with speech recognition, reasoning, voice, turn-taking, tools and telephony on the other end of the socket.
- [Pipecat](https://thunderphone.com/integrations/pipecat): Run a ThunderPhone voice agent as the speech-to-speech service inside a Pipecat pipeline with the pipecat-thunderphone package: your transport and telephony, ThunderPhone's recognition, reasoning, voice and turn-taking.
- [Plivo (bring your own number)](https://thunderphone.com/integrations/plivo): Connect a Plivo number to ThunderPhone through manual SIP, then verify it for inbound and outbound AI calls while keeping your trunk and number ownership.
- [REST API and webhooks](https://thunderphone.com/integrations/rest-api-webhooks): Use ThunderPhone's REST API to manage agents and custom functions, then receive signed webhook events for call and workflow activity across your systems.
- [Salesforce](https://thunderphone.com/integrations/salesforce): Connect Salesforce to ThunderPhone so phone agents can search CRM records, update leads, and log call activity using approved operations during calls.
- [SignalWire (bring your own number)](https://thunderphone.com/integrations/signalwire): Connect a SignalWire number to ThunderPhone through manual SIP for verified inbound and outbound AI calls while retaining your production trunk and number.
- [Slack](https://thunderphone.com/integrations/slack): Connect Slack so a ThunderPhone agent can find channels, search messages, and post approved updates while handling live calls and internal team follow-up.
- [Telnyx (bring your own number)](https://thunderphone.com/integrations/telnyx): Connect a Telnyx number to ThunderPhone for verified inbound and outbound AI phone calls while keeping your production telephony account, number, and routing.
- [TEN Framework](https://thunderphone.com/integrations/ten-framework): Run a ThunderPhone voice agent as the speech-to-speech model of a TEN Framework graph with the thunderphone_mllm_python extension, next to the other realtime model extensions.
- [Twilio (bring your own number)](https://thunderphone.com/integrations/twilio): Connect a Twilio account to ThunderPhone, import numbers you already own, verify the route, and use them for inbound and outbound AI calls on business lines.
- [Vonage (bring your own number)](https://thunderphone.com/integrations/vonage): Connect a Vonage number to ThunderPhone through manual SIP for verified inbound and outbound AI calls while keeping your telephony setup and ownership.
- [Zapier (via MCP)](https://thunderphone.com/integrations/zapier): Connect a Zapier MCP endpoint so a ThunderPhone agent can discover and use the actions it exposes during live phone conversations and phone intake flows.

### Languages

- [AI Phone Agents in Arabic](https://thunderphone.com/languages/arabic-ai-phone-agents): Build an Arabic-speaking AI phone agent with eight compatible voices, optional premium Arabic voices, an Arabic dashboard, dedicated Arabic documentation, and automatic mid-call language switching.
- [AI Phone Agents in Bengali](https://thunderphone.com/languages/bengali-ai-phone-agents): Build a Bengali-speaking AI phone agent with eight compatible voices including Pooja and Rubel, a Bengali dashboard and documentation edition, and automatic mid-call language switching.
- [AI Phone Agents in Bulgarian](https://thunderphone.com/languages/bulgarian-ai-phone-agents): Build a Bulgarian-speaking AI phone agent with eight compatible voices, a Bulgarian dashboard and documentation edition, and automatic mid-call language switching.
- [AI Phone Agents in Cantonese](https://thunderphone.com/languages/cantonese-ai-phone-agents): Build a Cantonese-speaking AI phone agent with six compatible voices, Cantonese dashboard and documentation localization, and automatic mid-call language switching.
- [AI Phone Agents in Chinese](https://thunderphone.com/languages/chinese-ai-phone-agents): Build a Chinese-speaking AI phone agent with eight compatible voices, a Chinese dashboard interface, dedicated Chinese documentation, and automatic mid-call language switching.
- [AI Phone Agents in Croatian](https://thunderphone.com/languages/croatian-ai-phone-agents): Build a Croatian-speaking AI phone agent with eight compatible voices, a Croatian dashboard and documentation edition, and automatic mid-call language switching.
- [AI Phone Agents in Czech](https://thunderphone.com/languages/czech-ai-phone-agents): Build a Czech-speaking AI phone agent with eight compatible voices, a Czech dashboard, dedicated Czech documentation, and automatic mid-call language switching.
- [AI Phone Agents in Danish](https://thunderphone.com/languages/danish-ai-phone-agents): Build a Danish-speaking AI phone agent with eight compatible voices, a Danish dashboard interface, dedicated Danish documentation, and automatic mid-call language switching.
- [AI Phone Agents in Dutch](https://thunderphone.com/languages/dutch-ai-phone-agents): Build a Dutch-speaking AI phone agent with eight compatible voices, a Dutch dashboard interface, dedicated Dutch documentation, and automatic mid-call language switching.
- [AI Phone Agents in English](https://thunderphone.com/languages/english-ai-phone-agents): Build an English-speaking AI phone agent with 46 compatible voices, 12 optional premium English voices, and automatic mid-call switching to any other supported language.
- [AI Phone Agents in Estonian](https://thunderphone.com/languages/estonian-ai-phone-agents): Build an Estonian-speaking AI phone agent with six compatible voices, an Estonian dashboard interface, Estonian documentation, and automatic mid-call language switching.
- [AI Phone Agents in Finnish](https://thunderphone.com/languages/finnish-ai-phone-agents): Build a Finnish-speaking AI phone agent with eight compatible voices including Milla and Matti, a Finnish dashboard and documentation edition, and automatic mid-call language switching.
- [AI Phone Agents in French](https://thunderphone.com/languages/french-ai-phone-agents): Build a French-speaking AI phone agent with eight compatible voices including premium options Pauline and Marc, a French dashboard and documentation edition, and automatic mid-call language switching.
- [AI Phone Agents in German](https://thunderphone.com/languages/german-ai-phone-agents): Build a German-speaking AI phone agent with eight compatible voices including premium options Viktoria and Nico, a German dashboard and documentation edition, and automatic mid-call language switching.
- [AI Phone Agents in Greek](https://thunderphone.com/languages/greek-ai-phone-agents): Build a Greek-speaking AI phone agent with eight compatible voices, a Greek dashboard interface, Greek documentation, and automatic mid-call language switching.
- [AI Phone Agents in Gujarati](https://thunderphone.com/languages/gujarati-ai-phone-agents): Build a Gujarati-speaking AI phone agent with eight compatible voices, a Gujarati dashboard interface, Gujarati documentation, and automatic mid-call language switching.
- [AI Phone Agents in Hebrew](https://thunderphone.com/languages/hebrew-ai-phone-agents): Build a Hebrew-speaking AI phone agent with eight compatible voices, no language surcharge, a Hebrew dashboard interface, dedicated Hebrew documentation, and automatic mid-call language switching.
- [AI Phone Agents in Hindi](https://thunderphone.com/languages/hindi-ai-phone-agents): Build a Hindi-speaking AI phone agent with Hindi dashboard and documentation support, eight compatible voices, and automatic mid-call language switching.
- [AI Phone Agents in Hungarian](https://thunderphone.com/languages/hungarian-ai-phone-agents): Build a Hungarian-speaking AI phone agent with eight compatible voices, a Hungarian dashboard interface, dedicated Hungarian documentation, and automatic mid-call language switching.
- [AI Phone Agents in Indonesian](https://thunderphone.com/languages/indonesian-ai-phone-agents): Build an Indonesian-speaking AI phone agent with eight compatible voices, an Indonesian dashboard and documentation edition, and automatic mid-call language switching.
- [AI Phone Agents in Italian](https://thunderphone.com/languages/italian-ai-phone-agents): Build an Italian-speaking AI phone agent with eight compatible voices, an Italian dashboard and documentation edition, and automatic mid-call language switching.
- [AI Phone Agents in Japanese](https://thunderphone.com/languages/japanese-ai-phone-agents): Build a Japanese-speaking AI phone agent with eight compatible voices, a Japanese dashboard and documentation edition, and automatic mid-call language switching.
- [AI Phone Agents in Kannada](https://thunderphone.com/languages/kannada-ai-phone-agents): Build a Kannada-speaking AI phone agent with eight compatible voices, a Kannada dashboard and documentation edition, and automatic mid-call language switching.
- [AI Phone Agents in Korean](https://thunderphone.com/languages/korean-ai-phone-agents): Build a Korean-speaking AI phone agent with eight compatible voices, a Korean dashboard, a dedicated Korean documentation edition, and automatic mid-call language switching.
- [AI Phone Agents in Latvian](https://thunderphone.com/languages/latvian-ai-phone-agents): Build a Latvian-speaking AI phone agent with six compatible voices, a Latvian dashboard, a dedicated Latvian documentation edition, and automatic mid-call language switching.
- [AI Phone Agents in Lithuanian](https://thunderphone.com/languages/lithuanian-ai-phone-agents): Build a Lithuanian-speaking AI phone agent with six compatible voices, a Lithuanian dashboard, Lithuanian documentation, and automatic mid-call language switching.
- [AI Phone Agents in Malayalam](https://thunderphone.com/languages/malayalam-ai-phone-agents): Build a Malayalam-speaking AI phone agent with eight compatible voices, a Malayalam dashboard, Malayalam documentation, and automatic mid-call language switching.
- [AI Phone Agents in Marathi](https://thunderphone.com/languages/marathi-ai-phone-agents): Build a Marathi-speaking AI phone agent with eight compatible voices, a Marathi dashboard interface, Marathi documentation, and automatic mid-call language switching.
- [AI Phone Agents in Norwegian](https://thunderphone.com/languages/norwegian-ai-phone-agents): Build a Norwegian-speaking AI phone agent with eight compatible voices, a Norwegian dashboard interface, dedicated Norwegian documentation, and automatic mid-call language switching.
- [AI Phone Agents in Polish](https://thunderphone.com/languages/polish-ai-phone-agents): Build a Polish-speaking AI phone agent with eight compatible voices at no language surcharge, a Polish dashboard interface, dedicated Polish documentation, and automatic mid-call language switching.
- [AI Phone Agents in Portuguese](https://thunderphone.com/languages/portuguese-ai-phone-agents): Build a Portuguese-speaking AI phone agent with eight compatible voices at no language surcharge, a Portuguese dashboard interface, dedicated Portuguese documentation, and automatic mid-call language switching.
- [AI Phone Agents in Punjabi](https://thunderphone.com/languages/punjabi-ai-phone-agents): Build a Punjabi-speaking AI phone agent with eight compatible voices, a Punjabi dashboard interface, localized documentation, and automatic mid-call language switching.
- [AI Phone Agents in Romanian](https://thunderphone.com/languages/romanian-ai-phone-agents): Build a Romanian-speaking AI phone agent with eight compatible voices, a Romanian dashboard interface, dedicated Romanian documentation, and automatic mid-call language switching.
- [AI Phone Agents in Russian](https://thunderphone.com/languages/russian-ai-phone-agents): Build a Russian-speaking AI phone agent with eight compatible voices, no language surcharge, a Russian dashboard interface, dedicated Russian documentation, and automatic mid-call language switching.
- [AI Phone Agents in Serbian](https://thunderphone.com/languages/serbian-ai-phone-agents): Build a Serbian-speaking AI phone agent with six compatible voices, a Serbian dashboard interface, localized documentation, and automatic mid-call language switching.
- [AI Phone Agents in Slovak](https://thunderphone.com/languages/slovak-ai-phone-agents): Build a Slovak-speaking AI phone agent with eight compatible voices, a Slovak dashboard and documentation edition, and automatic mid-call language switching.
- [AI Phone Agents in Slovenian](https://thunderphone.com/languages/slovenian-ai-phone-agents): Build a Slovenian-speaking AI phone agent with six compatible voices, a Slovenian dashboard and documentation edition, and automatic mid-call language switching.
- [AI Phone Agents in Spanish](https://thunderphone.com/languages/spanish-ai-phone-agents): Build a Spanish-speaking AI phone agent with Spanish dashboard and documentation support, 12 compatible voices, and automatic mid-call language switching.
- [AI Phone Agents in Swahili](https://thunderphone.com/languages/swahili-ai-phone-agents): Build a Swahili-speaking AI phone agent with six compatible voices, a Swahili dashboard and documentation edition, and automatic mid-call language switching.
- [AI Phone Agents in Swedish](https://thunderphone.com/languages/swedish-ai-phone-agents): Build a Swedish-speaking AI phone agent with eight compatible voices, a Swedish dashboard and dedicated documentation edition, and automatic mid-call language switching.
- [AI Phone Agents in Tamil](https://thunderphone.com/languages/tamil-ai-phone-agents): Build a Tamil-speaking AI phone agent with eight compatible voices, a Tamil dashboard interface, Tamil documentation, and automatic mid-call language switching.
- [AI Phone Agents in Telugu](https://thunderphone.com/languages/telugu-ai-phone-agents): Build a Telugu-speaking AI phone agent with eight compatible voices, a Telugu dashboard interface, Telugu documentation, and automatic mid-call language switching.
- [AI Phone Agents in Thai](https://thunderphone.com/languages/thai-ai-phone-agents): Build a Thai-speaking AI phone agent with eight compatible voices, a Thai dashboard interface, Thai documentation, and automatic mid-call language switching.
- [AI Phone Agents in Turkish](https://thunderphone.com/languages/turkish-ai-phone-agents): Build a Turkish-speaking AI phone agent with eight compatible voices, a Turkish dashboard interface, dedicated Turkish documentation, and automatic mid-call language switching.
- [AI Phone Agents in Ukrainian](https://thunderphone.com/languages/ukrainian-ai-phone-agents): Build a Ukrainian-speaking AI phone agent with seven compatible voices, a Ukrainian dashboard interface, dedicated Ukrainian documentation, and automatic mid-call language switching.
- [AI Phone Agents in Urdu](https://thunderphone.com/languages/urdu-ai-phone-agents): Build an Urdu-speaking AI phone agent with eight compatible voices, an Urdu dashboard interface, an Urdu documentation edition, and automatic mid-call language switching.
- [AI Phone Agents in Vietnamese](https://thunderphone.com/languages/vietnamese-ai-phone-agents): Build a Vietnamese-speaking AI phone agent with eight compatible voices, a Vietnamese dashboard interface, dedicated Vietnamese documentation, and automatic mid-call language switching.

## Blog

- [Blog RSS feed](https://thunderphone.com/blog/rss.xml)
- [Our first impressions of the GPT-Live-1 API for voice agents](https://thunderphone.com/blog/gpt-live-first-impressions) (2026-09-12): We spent the first two days after GPT-Live-1's API release putting it on a real phone number with a 13,000-token agent script. The conversational naturalness is exceptional. The instruction-following is not. Real transcripts inside.
- [Introducing TranslateMyCall](https://thunderphone.com/blog/introducing-translatemycall) (2026-09-02): One free phone number that live-interprets your calls across 70+ languages. Dial (228) 888-8666, merge in anyone — or put it on speakerphone — and both sides hear their own language. No app, no account.
- [Announcing ThunderPhone v2](https://thunderphone.com/blog/thunderphone-self-serve) (2026-08-27): ThunderPhone v2 is live for everyone: self-serve voice AI from 2c/min with models included, a 99.4% Big Bench Audio score, and a full platform for building, testing, and monitoring AI phone agents.
- [Announcing ThunderPhone](https://thunderphone.com/blog/announcing-thunderphone) (2026-03-10): Today, we’re proud to announce the public launch of ThunderPhone, which makes it easy to automate phone calls with AI. With a completely different integrated architecture from other phone AI platforms, ThunderPhone is able to achieve much higher performance, lower cost, and fewer integrations headaches.

## Documentation

- [Documentation](https://thunderphone.com/docs): Product and API documentation in English plus 47 translated languages (see https://thunderphone.com/docs/llms.txt).
- [Documentation in Arabic](https://thunderphone.com/ar/docs)
- [Documentation in Bulgarian](https://thunderphone.com/bg/docs)
- [Documentation in Bengali](https://thunderphone.com/bn/docs)
- [Documentation in Czech](https://thunderphone.com/cs/docs)
- [Documentation in Danish](https://thunderphone.com/da/docs)
- [Documentation in German](https://thunderphone.com/de/docs)
- [Documentation in Greek](https://thunderphone.com/el/docs)
- [Documentation in Spanish](https://thunderphone.com/es/docs)
- [Documentation in Estonian](https://thunderphone.com/et/docs)
- [Documentation in Finnish](https://thunderphone.com/fi/docs)
- [Documentation in French](https://thunderphone.com/fr/docs)
- [Documentation in Gujarati](https://thunderphone.com/gu/docs)
- [Documentation in Hebrew](https://thunderphone.com/he/docs)
- [Documentation in Hindi](https://thunderphone.com/hi/docs)
- [Documentation in Croatian](https://thunderphone.com/hr/docs)
- [Documentation in Hungarian](https://thunderphone.com/hu/docs)
- [Documentation in Indonesian](https://thunderphone.com/id/docs)
- [Documentation in Italian](https://thunderphone.com/it/docs)
- [Documentation in Japanese](https://thunderphone.com/ja/docs)
- [Documentation in Kannada](https://thunderphone.com/kn/docs)
- [Documentation in Korean](https://thunderphone.com/ko/docs)
- [Documentation in Lithuanian](https://thunderphone.com/lt/docs)
- [Documentation in Latvian](https://thunderphone.com/lv/docs)
- [Documentation in Malayalam](https://thunderphone.com/ml/docs)
- [Documentation in Marathi](https://thunderphone.com/mr/docs)
- [Documentation in Norwegian Bokmål](https://thunderphone.com/nb/docs)
- [Documentation in Dutch](https://thunderphone.com/nl/docs)
- [Documentation in Punjabi](https://thunderphone.com/pa/docs)
- [Documentation in Polish](https://thunderphone.com/pl/docs)
- [Documentation in Portuguese](https://thunderphone.com/pt/docs)
- [Documentation in Romanian](https://thunderphone.com/ro/docs)
- [Documentation in Russian](https://thunderphone.com/ru/docs)
- [Documentation in Slovak](https://thunderphone.com/sk/docs)
- [Documentation in Slovenian](https://thunderphone.com/sl/docs)
- [Documentation in Serbian](https://thunderphone.com/sr/docs)
- [Documentation in Swedish](https://thunderphone.com/sv/docs)
- [Documentation in Swahili](https://thunderphone.com/sw/docs)
- [Documentation in Tamil](https://thunderphone.com/ta/docs)
- [Documentation in Telugu](https://thunderphone.com/te/docs)
- [Documentation in Thai](https://thunderphone.com/th/docs)
- [Documentation in Turkish](https://thunderphone.com/tr/docs)
- [Documentation in Ukrainian](https://thunderphone.com/uk/docs)
- [Documentation in Urdu](https://thunderphone.com/ur/docs)
- [Documentation in Vietnamese](https://thunderphone.com/vi/docs)
- [Documentation in Cantonese](https://thunderphone.com/yue/docs)
- [Documentation in Chinese (Simplified)](https://thunderphone.com/zh/docs)
- [Documentation in Chinese (Traditional)](https://thunderphone.com/zh-Hant/docs)

## External Resources

- [Trust center](https://thunderphone.com/security)
- [Application login](https://app.thunderphone.com/login)

## Full Context

For a longer AI-readable summary of the public marketing site, see [llms-full.txt](https://thunderphone.com/llms-full.txt).