TOOLS
Cartesia
Low-latency voice synthesis API for real-time AI
Part of this entry was LLM-drafted and is being polished.
Cartesia (formerly Rime) provides ultra-low-latency TTS APIs designed for voice AI agents — first-byte latency under 100ms in some configurations. Founded by ex-Stanford researchers; targets developers building real-time conversational products.
Editor's verdict
Right pick for voice agent backends where every 100ms of latency matters — phone calls, real-time conversation. Quality is good; latency is the moat. ElevenLabs is catching up on latency; benchmark for your specific use case at decision time. For non-real-time TTS (audiobooks, voiceovers), ElevenLabs is more featured.
Use cases
- low-latency tts
- voice agent backend
- realtime voice ai
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Last updated: 2026-04-29