The cheapest AI receptionist in 2026: subscriptions, per-call plans, and usage pricing compared

For a typical small-business workload of 300 calls × 4 connected minutes = 1,200 connected minutes a month, published prices run from about $24 a month on a usage-priced platform to several hundred dollars on per-call plans. That is illustrative arithmetic, not a quote: ThunderPhone Spark computes as 1,200 × $0.02 = $24.

There is no universally cheapest AI receptionist. The cheapest structure depends on how many people call, how often they call, how long conversations last, and which features or languages you configure. Telephony and numbers can also be separate, so rerun the arithmetic for your own call length, language, and configuration before choosing.

Four AI receptionist pricing structures

Subscription with included minutes

A subscription charges a fixed monthly amount for an included block, then applies an overage rate. Phonely's plan cards currently show Starter at $50 monthly or $33 with annual billing for 200 minutes, and Professional at $150 monthly or $100 with annual billing for 650 minutes. Its comparison table still says 250 and 750 minutes, respectively, so the page is internally inconsistent and buyers should confirm the actual allowance before purchasing. The failure mode is an overage cliff: once the included block is gone, each additional minute can dominate the bill. Phonely pricing, accessed 2026-09-01.

Per-call pricing

Smith.ai's AI Receptionist charges by completed call rather than conversation length. Its Free plan includes 25 calls, then charges $3 per call; Pro options range from $150 for 75 calls to $500 for 300 calls. This makes the monthly call count easy to understand, but a brief screening call and a longer appointment conversation consume the same one-call unit. Do not confuse this product with Smith.ai's separately priced, human-staffed Virtual Receptionist service. Smith.ai AI Receptionist pricing, accessed 2026-09-01.

Per-unique-customer pricing

Goodcall meters unique customers rather than calls or minutes. A customer is a caller with a unique phone number who interacts during the month, so repeat calls from the same number do not create additional usage units. Starter is $79 for 100 unique customers, Growth is $129 for 250, and Scale is $249 for 500; additional customers cost $0.50 each. This can work well for repeat callers, but forecasting is less intuitive when you know your call count and not your number of distinct callers. Goodcall pricing, accessed 2026-09-01.

Per-minute usage pricing

ThunderPhone charges only for usage, with no subscription, seat fee, or platform fee. Its all-in base-engine rates are Spark at 2¢ per minute, Bolt at 5¢, and Storm at 9¢, including speech recognition, the language model, and voice. The builder displays the rate for the exact configuration.

This avoids an included-minute cliff, but the bill varies with connected time. Selected premium voice or language paths can add up to 3¢ per minute, and telephony depends on the number setup. Calls are metered in quarter-minute increments with a 0.25-minute minimum.

Businesses with technical implementation support may also evaluate broader voice-agent platforms such as Retell and Bland, but this comparison centers on receptionist-oriented buying structures. Retell pricing, accessed 2026-09-01. Bland pricing, accessed 2026-09-01. For a broader platform comparison, see how voice AI platforms price.

Worked example: 300 four-minute calls

Assume 300 calls × 4 minutes = 1,200 connected minutes, monthly billing, no transfer charges, and approximately 250 unique callers. Every calculation below is illustrative arithmetic, not a quote.

Third-party inputs: Goodcall pricing, Phonely pricing, and Smith.ai AI Receptionist pricing, accessed 2026-09-01.

Phonely's comparison table says Professional includes 750 minutes rather than the plan card's 650. Using that alternative figure, the illustrative arithmetic, not a quote, is $150 + (1,200 − 750) × $0.30 = $150 + $135 = $285. The discrepancy changes the result by $30, which is why the included-minute allowance should be confirmed before buying. Phonely pricing, accessed 2026-09-01.

Goodcall's result depends on the unique-customer assumption. If all 300 calls came from different numbers, Growth would instead compute, illustratively and not as a quote, as $129 + (300 − 250) × $0.50 = $129 + $25 = $154. Scale would remain $249 under its published 500-customer allowance. Goodcall pricing, accessed 2026-09-01.

In this defined scenario, ThunderPhone Spark's published arithmetic is lowest among the configurations compared. Different call lengths, languages, caller distributions, and configurations can reorder the results.

Where each structure wins

At very low volume, a free tier can win on raw cost, while a flat $50 subscription can win on simplicity or bundled allowances even when it does not produce the lowest arithmetic. Phonely's Free plan includes 100 minutes with no overage path, and Smith.ai's Free plan includes 25 calls before per-call charges begin. Phonely pricing and Smith.ai AI Receptionist pricing, accessed 2026-09-01.

Per-call pricing makes budgeting straightforward when conversations vary in length. Against low per-minute usage pricing, however, its effective rate can remain high: using Smith.ai's displayed $1.67-per-call figure, the illustrative arithmetic, not a quote, is $1.67 ÷ 4 = $0.4175, or about $0.42 per minute for a four-minute call. Smith.ai AI Receptionist pricing, accessed 2026-09-01.

Per-minute usage often becomes more economical as call counts and conversation lengths grow because there is no subscription block to outgrow. Per-unique-customer pricing can be attractive when a smaller group of customers calls repeatedly, but it is harder to forecast from call volume alone.

Human answering services occupy a different cost category. Smith.ai's human-staffed Virtual Receptionist product publishes overage rates of $8.50–$11.50 per call, which can be an order of magnitude or more above some AI configurations. Smith.ai Virtual Receptionist pricing, accessed 2026-09-01.

What “cheap” still needs to include

A cheap AI answering service for a small business is only useful if it handles the work that would otherwise reach an employee or answering service. Check these capabilities before comparing totals:

• After-hours coverage: Confirm whether the agent can answer continuously or whether schedules and call volumes are tier-limited.
• Appointment booking: Verify the calendars and business systems it can actually update, not just whether it can collect a callback request.
• Human transfers: Ask whether time after a transfer bills separately and what happens when nobody answers. Phonely adds $0.02 per post-transfer minute on Starter and Professional. Phonely pricing, accessed 2026-09-01.
• Spam screening: Determine whether unwanted calls still consume minutes, calls, or unique-customer allowances.
• Transcripts: Check whether transcripts are included, searchable, exportable, and retained for an appropriate period.

On some usage-priced platforms, these are platform capabilities rather than reasons to buy a larger subscription bundle. See ThunderPhone pricing explained for its configuration and billing mechanics. Subscription matrices may gate adjacent requirements: Phonely lists SIP trunking and the HIPAA BAA at Enterprise. Phonely pricing, accessed 2026-09-01.

ThunderPhone is GDPR and HIPAA compliant, and customers remain responsible for configuring their workflows, data handling, recordings, and notices for their own obligations.

FAQ

How much does an AI receptionist cost per month?

It can range from free for tightly limited usage to hundreds of dollars for a few hundred calls. In the defined 300-call, 1,200-minute example, the illustrative totals, not quotes, are $24–$108 for ThunderPhone's three engines, $129 for Goodcall Growth under the 250-unique-customer assumption, $285–$315 for Phonely Professional depending on which published minute allowance applies, and $500 for Smith.ai's 300-call AI Receptionist option. Goodcall pricing, Phonely pricing, and Smith.ai AI Receptionist pricing, accessed 2026-09-01.

What is the cheapest AI receptionist?

There is no universally cheapest provider, but ThunderPhone Spark has the lowest published arithmetic in this defined 1,200-minute comparison. Very light usage may fit a free plan, repeat callers may favor unique-customer pricing, and short or highly variable calls may favor a per-call package. Rerun the arithmetic with your call length, language, caller mix, telephony setup, and required configuration because those inputs can change the ordering.

Is an AI receptionist cheaper than an answering service?

AI receptionists are generally cheaper on published usage prices, but they do not provide the same service as a human receptionist. Smith.ai's AI product lists a 300-call option at $500, while its separate human-staffed service publishes overage rates of $8.50–$11.50 per call. The right comparison also needs to account for judgment, escalation, integrations, and the calls that still require a person. Smith.ai AI Receptionist pricing and Smith.ai Virtual Receptionist pricing, accessed 2026-09-01.

What hidden fees should I check?

Check overage, telephony, numbers, transfers, feature gates, annual-billing quirks, and the unit being counted. Phonely displays Starter overage at $0.25 per minute on monthly billing but $0.35 under the annual toggle, despite the lower annual subscription price. Goodcall counts unique customers rather than calls or minutes. Also check for a recurring platform fee and whether compliance, integrations, or transfers require a higher tier. Phonely pricing and Goodcall pricing, accessed 2026-09-01.

Sources and freshness

Third-party pricing and plan details were checked against the linked Phonely pricing, Smith.ai AI Receptionist pricing, Smith.ai Virtual Receptionist pricing, Goodcall pricing, Retell pricing, and Bland pricing pages, accessed 2026-09-01. ThunderPhone pricing and product details reflect its published information as of 2026-09-01.

This guide is documentation-based; no vendor invoice or live call was tested. Phonely's plan-card and comparison-table minute allowances conflict, and pricing can change, so confirm the live terms and reproduce the arithmetic with your own workload before making a purchasing decision.