Voice Agent Platform
Retell AI review
Developer platform for building and deploying AI phone agents
Pros
- Component-level pricing (voice infra, LLM, TTS, telephony) is published, so per-minute costs are predictable once your stack is chosen
- SOC 2, HIPAA, and GDPR compliance with a self-serve BAA, which matters for healthcare and other regulated call use cases
- Bring-your-own telephony via Twilio or Telnyx, plus a WebSocket streaming API for custom LLM and web-based agents
- Solid conversational fundamentals: interruption handling, multilingual support across 30+ languages, and real-time call analytics
Cons
- The advertised $0.07/minute is only the base layer; realistic production costs are noticeably higher
- Iterating on call flows and agent behaviour often needs developer involvement, which slows non-technical teams down
- Voice quality and language coverage are uneven outside English, with reported weaknesses in some European languages
- Lacks some enterprise governance features such as role-based access control and audit trails
Our take
Retell AI sits squarely in the developer-first tier of voice agent platforms, alongside Vapi: it gives you the streaming infrastructure, telephony hooks, and model choice to build a phone or web agent, and expects you to assemble and tune the stack yourself. Its clearest advantages are transparent component pricing and a compliance posture (SOC 2, HIPAA, GDPR) that many younger voice startups still lack. Teams without engineering support, or those who mainly need a packaged inbound receptionist, will find more turnkey options elsewhere; teams building voice into their own product will appreciate the control.
Best for
Product and engineering teams that want to ship production phone or web voice agents with a transparent per-minute cost model
Pricing
Usage-based, starting around $0.07/minute for the voice layer; all-in costs typically land higher once LLM, text-to-speech, and telephony are added. $10 free credit on signup, plus small monthly fees for phone numbers and extra concurrency
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