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The homepage offers a Start free signup route and a live demo, but does not state a trial length, included minutes or credit terms.
Learn moreThunderPhone
Production voice agents for inbound calls and outbound campaigns, from 2 cents per minute
Beginner API
What is ThunderPhone?
ThunderPhone is an AI calls tool. Voice AI platform for inbound reception and outbound calling, with a no-code operator console, an API on the same runtime, SIP trunking, knowledge grounding, live supervision and self-improving call scoring. Advertises 2 cents per minute and 40+ languages.
ThunderPhone is a voice AI platform for building and running production phone agents. It handles inbound calls and outbound campaigns on the same stack, either over real telephony through PSTN and SIP or embedded directly in a website or app. The company positions the product on two claims: top accuracy on the Big Bench Audio benchmark (99.4% as of July 2026) and pricing from about 2 cents per minute, which it says undercuts competing voice AI platforms and outsourced call centers by a wide margin. The build process is deliberately short. An operator describes the job in plain language, picks a voice and an intelligence tier (Spark, Bolt or Storm), then connects a carrier through a guided SIP wizard that detects and verifies the trunk without a telecom ticket. Integrations are wired by pasting a request, and knowledge bases can be attached so agents answer from uploaded documents. Agents switch languages mid-call across 40+ languages, capture keypad input, detect voicemail and screeners, and transfer to humans with context preserved. A two-model design pairs a fast responder with a thinking model so scripts with strict rules, such as a ban on dosage advice, are followed instead of improvised around. Once live, every production call is transcribed and scored, failures surface automatically, and fixes are proposed for one-click review. A/B experiments split live traffic between agent variants. Buyers who want control can call the same voice runtime through a POST to the API; enterprises can bring their own LLM, choose data residency and negotiate per-minute targets. HIPAA and GDPR are covered with a BAA and DPA at no extra charge. It suits support desks, scheduling teams, pre-sales operations and anyone running reminder or follow-up calling at volume. Compared with developer-first voice APIs such as Vapi, Retell and Bland, ThunderPhone leans harder on an operator-friendly front end and integrated telephony, at the cost of a smaller public track record.
How do you use ThunderPhone?
1Create an account and open the dashboard
Sign up at the app and land in the operator console, where agents, knowledge bases, campaigns, experiments, test calls and live calls are organized in one place.2Describe the agent and choose voice and intelligence
Write the job in plain language, then select a voice and an intelligence level among Spark, Bolt and Storm. Storm is the tier built for strict script adherence.3Connect your carrier over SIP
Run the guided wizard to bring your own carrier. It detects the trunk and verifies it live, so no telecom support ticket is needed to route calls.4Wire up integrations and knowledge
Paste a request and the wizard connects CRM, calendar and APIs, or attach MCP servers and document knowledge bases so the agent answers from your own material.5Test, then launch an outbound campaign
Use AI-graded test calls to check behavior before going live. For outbound work, upload a CSV of up to 5,000 contacts and set timezone-based calling windows and retries.6Review call scores and apply suggested fixes
After launch, read the scores on real calls, watch flagged failures, and apply proposed agent updates. Split traffic between variants to prove which version performs better.
Pros and cons
Pros
- Published benchmark lead (99.4% on Big Bench Audio, July 2026) with the dataset public on Hugging FaceAI
- Base rate from 2 cents per minute is well below the 7 cents cited for competing voice AI platformsAI
- Genuine no-code path: prompt, pick voice and intelligence tier, attach a SIP trunk, launchAI
- Every production call is scored and fixes are proposed automatically, with A/B experiments to confirm winsAI
- HIPAA and GDPR support with BAA and DPA included at no extra charge, plus a public status pageAI
Cons
- The 2 cent figure is a base rate; long prompts, higher intelligence tiers and premium voices add surcharges that are not quantified on the homepageAI
- 40+ languages on the homepage versus 47 in the meta description, so the language count needs verifying before committingAI
- ThunderHuman, the human-agent option for TCPA-compliant cold outreach, is a separate paid enterprise service rather than part of the planAI
- Calls are limited to 5,000 contacts per uploaded CSV for campaigns, which may be tight for large list operationsAI
- Performance claims rest largely on self-published benchmarks and a short company history since 2024, so independent long-run results are thinAI
How much does ThunderPhone cost?
Pricing
Per-minute usage pricing starting at 2 cents per minute, with surcharges for long prompts, added intelligence and premium voices. The homepage compares this with 7 cents or more for competing voice AI platforms and 13 to 67 cents for human call centers, and links to a full pricing page. No subscription tiers are listed on the homepage.
Learn moreSupport
Support entry points listed on the homepage are the documentation site, the trust center for compliance and subprocessors, and a public status page with 90-day uptime history. No phone or email support channel is stated.
Learn moreIntegrations
The setup wizard connects CRM, calendar and APIs from a pasted request, and agents can also attach MCP servers and knowledge bases. A REST API covers custom workflows such as placing outbound calls.
Learn moreFeatures
Inbound reception and outbound campaigns with pacing and retries, SIP trunking, DTMF capture, voicemail and screener detection, warm and cold transfers, knowledge grounding from uploaded documents, live supervision with whisper guidance, AI-graded test calls, A/B experiments, role-based team access, API access to the same runtime, and 40+ languages with mid-call switching.
Learn moreFrequently asked questions about ThunderPhone
How much does ThunderPhone cost?
Per-minute usage pricing starting at 2 cents per minute, with surcharges for long prompts, added intelligence and premium voices. The homepage compares this with 7 cents or more for competing voice AI platforms and 13 to 67 cents for human call centers, and links to a full pricing page. No subscription tiers are listed on the homepage.Does ThunderPhone offer a free trial?
The homepage offers a Start free signup route and a live demo, but does not state a trial length, included minutes or credit terms.Does ThunderPhone have an API?
Yes, ThunderPhone offers an API.How do you use ThunderPhone?
The walkthrough on this page covers 6 steps: 1. Create an account and open the dashboard 2. Describe the agent and choose voice and intelligence 3. Connect your carrier over SIP 4. Wire up integrations and knowledge 5. Test, then launch an outbound campaign 6. Review call scores and apply suggested fixes.What platforms does ThunderPhone support?
ThunderPhone is available on Web App.What does ThunderPhone integrate with?
The setup wizard connects CRM, calendar and APIs from a pasted request, and agents can also attach MCP servers and knowledge bases. A REST API covers custom workflows such as placing outbound calls.
Status
StatusActive
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Added10/21/2026
Platforms
Web App
Pricing
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