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Cartesia

Real-time voice AI models and API for building voice agents

Cartesia builds low-latency voice AI models, led by its Sonic text-to-speech model, for developers creating real-time voice agents, customer service bots and interactive apps. Its API and web playground offer many languages, instant voice cloning and fine control over emotion and speed. The company's research is based on state space model architectures.

Cost / License
FreemiumProprietary
Categories
AI Voice & Text to Speech
Platforms
Web
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features
4
alternatives
5
platform
1
Updated
Oct 12, 2026

Features

Our take

Pros

  • Low-latency Sonic text-to-speech suited to real-time voice agents
  • Instant voice cloning from a short recording
  • Fine control over emotion and speaking speed

Cons

  • Developer-focused, with little for non-technical creators
  • Higher volumes and advanced features require paid plans

Editorial assessment by the Alternatives.tools team, based on what the product is known for. Not a user review.

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