Retell AI vs Vocode
A side-by-side comparison of capabilities, autonomy, integrations, and pricing to help you choose.
Short answer: choose Retell AI if you want platform to build, test, deploy, and monitor ai voice agents for calls (Autonomous agent, usage); choose Vocode if you want open-source framework for building real-time voice llm agents (Assistant, free).
| Retell AI | Vocode | |
|---|---|---|
| What it is | Platform to build, test, deploy, and monitor AI voice agents for calls | Open-source framework for building real-time voice LLM agents |
| Type | platform | framework |
| Autonomy | Autonomous agent | Assistant |
| Pricing | usage · $0.07/min voice engine (model + telephony billed on top); Enterprise from $8,000 | free · Free (open source, MIT) |
| Best for | developers, smb, mid-market, enterprise | developers |
| Deployment | saas, api | self-hosted, api |
| Modalities | voice, text, api | voice, text, api, code |
| Models | model-agnostic, gpt, claude | model-agnostic, open-source |
| Protocols | rest-api, function-calling | rest-api, function-calling |
| Integrations | Twilio, Telnyx, Vonage, ElevenLabs, PlayHT | Twilio, Vonage, Zoom, Deepgram, ElevenLabs, Cartesia |
| Capabilities | 4 documented | 3 documented |
Retell AI
- +Provider-flexible: bring your own telephony, voices, and LLM, or use Retell's built-in carrier
- +Structured Conversation Flow Agents (nodes and transitions) give fine control alongside looser prompt-based agents
- +Usage-based pricing with no mandatory base subscription and free credits to start; built-in testing and monitoring
- -Advertised $0.07/min covers only the voice engine; LLM, telephony, and international add to real per-minute cost
- -Building reliable structured flows for complex calls takes meaningful human setup
Vocode
- +Genuinely modular and provider-agnostic across a broad STT/TTS/LLM menu
- +MIT-licensed and fully self-hostable with no lock-in
- +Solves the hard real-time voice problems (latency, endpointing, interruptions)
- -Effectively unmaintained: no commits since November 2024, making it production-risky
- -The hosted product appears wound down and the marketing site redirects to GitHub
Which should you choose?
Retell AI is platform to build, test, deploy, and monitor ai voice agents for calls, best for developers, smb, mid-market, enterprise. Vocode is open-source framework for building real-time voice llm agents, best for developers. The right choice depends on the autonomy level you want, your existing integrations, and your budget, all compared above.