Cartesia vs Retell AI
Side-by-side comparison of Cartesia and Retell AI: pricing, features, API access, and community ratings.
AI comparison summary
TL;DR: Cartesia is a foundational voice AI infrastructure provider offering separate STT, TTS, and agent components with ultra-low latency (<600ms) powered by their proprietary SSM architecture, ideal for developers building custom voice solutions. Retell AI is a complete phone call automation platform with workflow orchestration, no-code builder, and built-in campaign dialer, optimized for businesses deploying conversational agents at scale. Choose Cartesia for maximum flexibility and cutting-edge latency, Retell for faster deployment of phone-based automation with pre-built workflows.
| Category | Voice & speech | Voice & speech |
| Pricing | Freemium | Freemium |
| Starting price | ||
| Free tier | ||
| Audience | All audiences | All audiences |
| API available | ||
| Open source | ||
| Self-hostable | ||
| Model provider | Cartesia | Multiple (OpenAI GPT, Anthropic Claude, Google Gemini, Custom LLM) |
| Founded | ||
| Headquarters | ||
| Key strengths |
|
|