What is Cartesia?
Cartesia builds fast, realistic text-to-speech models such as Sonic, optimised for real-time voice agents and conversational AI. It offers voice cloning and an API with very low latency.
Best for: Voice agent developers, Startups.
Key features
- Sonic TTS model
- Low-latency streaming
- Voice cloning
- Emotion and speed control
- API
Pros and cons
Pros
- Among the lowest latency TTS
- Natural, expressive voices
- Built for developers
Cons
- Primarily an API product
- Less suited to studio voiceover workflows
Cartesia pricing
| Pricing model | Free plan |
|---|---|
| Starting price | Free |
| Platforms | API, Web |
| Launched | 2023 |
Prices change often. Check the Cartesia website for current plans.
Our verdict
Cartesia scores 8.3/10 in our review. Its biggest strength: among the lowest latency TTS. The main drawback: primarily an API product. If it isn't the right fit, OpenAI API is the closest alternative.
Frequently asked questions
What is Cartesia?
Cartesia builds fast, realistic text-to-speech models such as Sonic, optimised for real-time voice agents and conversational AI. It offers voice cloning and an API with very low latency.
Is Cartesia free?
Cartesia has a free plan with limits.
What are the best Cartesia alternatives?
Popular alternatives include OpenAI API, Salesforce Sales Cloud, ElevenLabs, Anthropic API.
Who is Cartesia best for?
Cartesia is best for voice agent developers, startups.