Vapi
Developer platform for phone voice agents
Cartesia
Low-latency speech models and voice agents
About
Low-latency voices for real-time agents
Cartesia builds its speech models on state space models to keep latency low enough for live conversation. Sonic handles text-to-speech with instant voice cloning on paid plans, Ink handles streaming transcription, and Managed Agents runs full voice agents. Models can run in the cloud, on-premise or on-device.
Features
- Sonic real-time text-to-speech
- Ink streaming speech-to-text
- Instant voice cloning from Pro
- Managed voice agents platform
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