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Pricing

The lowest prices on the market.

We believe in pricing so competitive that you won't find a lower price elsewhere, not even by building your own stack.

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Cost of one call minute
Other voice AI10¢
Platform feeTranscriptionLLMVoice
ThunderPhone Spark2¢
One all-inclusive rate

Spark at 2¢/min, vs a typical 10¢/min itemized stack.

Pick the brains for
the job.

Flat per-minute pricing. Move a workload up or down a tier whenever you want.

SparkCost effective2¢/min

Somewhat slower latency, but acceptable for most use cases. High audio understanding, average instruction following.

LatencyGood
Audio understandingStrong
Instruction followingGood
Start with Spark
BoltMuch faster4¢/min

Like Spark, but much faster. Slightly lower audio understanding, with higher instruction following.

LatencyStrong
Audio understandingGood
Instruction followingStrong
Start with Bolt
Most capableStormBest performance6¢/min

Strong latency with the best audio understanding and instruction following. Combines thinking and non-thinking LLMs.

Extra intelligence +9¢/min
LatencyStrong
Audio understandingExcellent
Instruction followingExcellent
Start with Storm
Typical other voice AI

Fast — but it mishears and drifts off-script.

Latency StrongAudio FairInstructions Fair

On hold? Pay 2¢/min on every tier. Straight to voicemail? Never more than one minute.

Long hold queues and voicemail runs make per-minute bills explode on other platforms. ThunderPhone detects them automatically and drops the price: hold time bills at a flat 2¢/min on every tier, and a call that goes straight to voicemail bills only the seconds it lasts, capped at a single minute at your plan rate — no matter how long the greeting rambles.

2¢/min hold
1¢/voicemail call

All tiers show base per-minute rates. Premium voices, long prompts, and demo numbers are optional add-ons, billed separately.

Simple rates, no surprise platform fees.

Included at no platform fee

Every tier ships with the full stack.

Inbound & outbound callsIncluded
SIP trunkingIncluded
Web voice widgetsIncluded
40+ languages understoodIncluded
Curated voice libraryIncluded
Testing & simulationsIncluded
Monitoring & transcriptsIncluded
Transfers & DTMFIncluded
Bring your own TTSIncluded

Optional upcharges

Pay only for what your use case needs.

Verbal acknowledgements Natural listening cues for Storm.+2¢/min
Call supervision / watchdog Automated oversight for Storm calls.+7¢/min
TTS upcharge (selected languages)Selected less-common languages carry a TTS upcharge.+3¢/min
Premium voices (any language)Optional premium voices across the voice library, including English. Default voices stay included at the base rate.+3¢/min
Long promptsNo prompt upcharge for the first 5K prompt tokens. Then billed per additional 10K-token block, at a per-tier rate.Spark +1¢/minBolt +2¢/minStorm +2¢/min
Demo numbersUS demo numbers from ThunderPhone, $1/month per number. Bring your own SIP trunk for free.+1¢/min

Cheaper than the competition.

Competitors charge platform fees on top of model costs and start at 7¢/min — and go much higher than that. ThunderPhone keeps the full stack affordable and charges no platform fee.

Cost per live call minuteReviewed May 2026
ThunderPhone Spark2¢/min
ThunderPhone Bolt4¢/min
ThunderPhone Storm6¢/min
Vapibest achievable~7¢+
Retell AIfrom7¢+
Bland AIfrom11¢+
Synthflowfrom15¢+
Vapi shown as a best-achievable typical stack: its platform fee plus transcriber, model, voice, and telephony. Competitor totals vary by provider choices.
Margins

Voice AI should be a low-margin business.

We think voice AI should work like AWS or Costco: low margins at high volumes, making customers successful at fair, low prices. We don't add a platform fee on every minute.

Guarantee

Best performance at any price. Best price for any performance.

We'll match or beat the performance of any competing stack on your use case, and we'll beat the pricing as well. We price so low that you won't even save money if you build your own stack in-house. (Reach out if you think we're wrong!)

Enterprise

Even lower rates possible (enterprise)

For high-volume use cases including but not limited to outbound with long hold times, voicemail, and screeners, we can reach 1¢/min or less with an enterprise agreement. Reach out to learn more.

See enterprise pricing
From 2¢/min, all-inclusive

Launch an agent in ten minutes.

Pick a tier, write a prompt, connect your number.

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