Reliable AI voice agents
from just 2 cents/minute.
Tired of AI that mishears users, disobeys prompts, and costs a fortune?
Set up a ThunderPhone agent in minutes and hear the difference.
GDPR Compliant
HIPAA CompliantThe lowest cost and the highest performance.
Up to 9x cheaper than alternatives
Our ensemble architecture eliminates the overhead of stitching together separate transcription, LLM, and TTS services — passing the savings directly to you.
Near-zero mistake rate
Storm scores a groundbreaking 99.4% on the industry-standard Big Bench Audio (BBA) benchmark — virtually eliminating reasoning errors so your agents follow complex instructions without derailing.
Everything you need to deploy reliable voice agents.
Connect any integration in seconds
Paste a cURL command, import an OpenAPI spec, or upload a Postman collection — we configure your integration automatically. No SDKs, no webhooks, no docs to read.
New Integration
Paste a cURL command, import an OpenAPI spec, or drop in a Postman collection — we'll configure your integration automatically.
Your SIP trunk, connected in under a minute
Enter a few details from your VoIP account — we support Twilio, Telnyx, SignalWire, Vonage, Plivo, or any standard SIP trunk. ThunderPhone handles the rest automatically.
SIP Trunk Setup
Built-in testing before you go live
Run text or full-audio tests, manually or automatically. Test human-to-AI and AI-to-AI scenarios. Catch issues before your customers do.
Automatic quality monitoring on every call
ThunderPhone scans every call transcript and flags issues — misunderstood instructions, unexpected responses, edge cases — so you can continuously improve your agent.
Ready to build your first phone agent?
Set up in minutes, scale to millions. Start for free — no credit card required.