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Cartesia
Cartesia is a voice API that generates natural, expressive real-time speech and transcriptions.
Cartesia is an AI platform that provides streaming text-to-speech, transcription, and production voice agents. Built on State Space Models, the platform generates natural and expressive voices in 44 languages with support for laughter. It is designed for developers and enterprises building interactive voice applications across industries like financial services. Users can deploy models via cloud, on-premise, or on-device environments to meet data residency and compliance needs. The platform offers instant and professional voice cloning capabilities.
Cartesia at a glance
- Best for: Software engineer, Marketer, Social media creator, Founder
- Runs on: API
- Pricing: Free plan; Pro $20/month; Startup $49/month; Scale $299/month; Enterprise custom pricing
- Released: May 2024
- Category: AI audio tool
- Website: cartesia.ai
Key features
- Streaming text-to-speech API
- Real-time speech generation in 44 languages
- Streaming transcription model
- Instant voice cloning
- Professional voice cloning
- Voice agents for interactive apps
- State space model architecture
- Cloud, on-premise, and on-device deployment
Use it for
- Building real-time voice agents
- Outbound verification calls on suspicious transactions
- Step-up authentication
- Live conversational speech generation
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- Moonshine — Runs entirely in your browser with no audio leaving your device.
- FluidAudio — Runs local audio AI models on Apple Neural Engine.
- Free ASR — Zero-dependency real-time streaming speech-to-text with no account login required.
- ElevenLabs — Natural AI voices, with 10,000+ voices in 70+ languages
- Babytalk — Runs entirely on-device with no cloud or internet required.
- Kokoro-FastAPI — Generate hours of high quality speech with an OpenAI-compatible endpoint.
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