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AI Tool Comparison
Cartesia vs Fish Audio
A side-by-side breakdown to help you pick the right tool for your workflow.
Cartesia
Power voice agents with sub-100ms TTS that streams in real time. Sonic's architecture eliminates the latency pause that makes voice bots feel robotic.
Audio
freemium
Fish Audio
Clone a voice from a 10-second clip and generate lifelike speech via API or playground, the same TTS technology running inside HeyGen and Retell.
Audio
freemium
Bottom Line
Cartesia and Fish Audio are rated evenly — the right pick comes down to which workflow you're running.
Choose Cartesia if…
Automation
Choose Fish Audio if…
Voice Cloning
| Attribute | Cartesia | Fish Audio |
|---|---|---|
| Category | Audio | Audio |
| Pricing | freemium | freemium |
| Pricing Detail | Free 10K characters/mo / $65/mo Growth | Free tier / Plus from $11/mo (annual) / higher plans to $749/mo / API pay-as-you-go from $15 per million characters |
| Rating |
Key Features
Cartesia
- Sub-100ms time-to-first-audio for real-time voice applications
- Streaming TTS — output starts before the full text is processed
- 50+ voices across accents and languages
- Voice cloning from a short audio sample
- Emotion and pacing control via SSML-style tags
- WebSocket API for low-latency real-time integration
Fish Audio
- Zero-shot voice cloning from 10-30 seconds of reference audio
- S1 flagship model with open-domain emotion and tone markers
- Pay-as-you-go API with WebSocket streaming and Python/TypeScript SDKs
- Open-weight self-hosting option under a commercial license
- Multilingual, cross-lingual speech with no phoneme dependency
Pros
Cartesia
- •Fastest TTS latency available — essential for conversational voice agents
- •Streaming architecture enables natural back-and-forth conversation pacing
- •Voice quality is competitive with ElevenLabs at significantly lower latency
Fish Audio
- •Same model quality already trusted in production by HeyGen and Retell
- •Genuinely usable free tier plus API pricing with no minimum commitment
- •Voice cloning quality holds up well even from short reference samples
Cons
Cartesia
- Premium voice quality still trails ElevenLabs on richness and nuance
- Voice cloning requires more audio samples than some competitors
- Growth plan pricing scales steeply with volume
Fish Audio
- Credit-to-minute math on the consumer plans takes a minute to understand
- Best commercial voice cloning rights require a paid plan, not the free tier
- Self-hosting the open-weight models is an enterprise-level engagement, not a quick setup