Cartesia Sonic
Cartesia Sonic: A low-cost streaming TTS API with cloning, 44 languages, and multiple endpoints. Ranked #24 of 222 in Text-to-Speech Software by our editors (7.1/10); pricing: Free plan; best for low-cost streaming TTS developers.
At a glance
- Editor score7.1 / 10
- PricingFree plan
- Best forLow-cost streaming TTS developers
- Free planYes
- Paid from$5/mo
- Commercial useYes
- Facts checked20 Sep 2026
Where it wins
- Free plan includes 20K monthly credits and text-to-speech
- Supports streaming, 44 languages, and voice cloning
- HTTP, SSE, and WebSocket endpoints support API workflows
Where it doesn't
- Verified integrations are limited
- The Free plan is not identified as commercially licensed
- Professional cloning and higher usage require paid tiers
Our verdict on Cartesia Sonic
Cartesia Sonic is a real-time text-to-speech model for developers building conversational voice applications, narration, dubbing, and voice agents. It generates streaming speech through Cartesia’s API and is also available in a web playground. Sonic 3.6 supports 44 languages, voice selection, voice IDs, instant and professional voice cloning, pronunciation dictionaries, and controls for speech speed and volume. Output is available in raw, WAV, and MP3 formats.
Pricing is accessible for smaller development projects. The Free plan provides 20K credits per month, text-to-speech, and speech-to-text. The Pro plan costs $5 per month and adds 100K credits, a commercial use license, and instant voice cloning. Startup costs $49 per month for 1.25M credits, professional voice cloning, and organizations. Scale costs $299 per month for 8M credits, priority support, and high concurrency limits. Enterprise provides custom credits and agent usage, custom concurrency limits, and SSO. Commercial use is explicitly included on Pro and higher plans.
Sonic fits teams that need streaming generation and direct API access across HTTP, SSE, and WebSocket endpoints, particularly when voice cloning or multilingual output matters. The combination of a free tier and a $5 monthly Pro plan makes it suitable for early development and smaller applications, while higher tiers address larger credit requirements and concurrency. Its narrower ecosystem fit may matter to buyers seeking a broad set of verified integrations. Teams that need a focused TTS API with cloning and configurable output should consider Cartesia Sonic; teams prioritizing extensive integrations should look elsewhere.
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Cartesia Sonic pricing
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Cartesia Sonic fact sheet
| Free plan | Yes |
|---|---|
| Paid from | $5/mo |
| Commercial use | Yes |
| Voice cloning | Yes |
| API access | Yes |
| Languages | Not verified |
| Maximum input | Not verified |
| Export formats | Not verified |
| Platforms | web, api |
| Deployment | Cloud, Self-hosted |
| Platforms | Web |
| Support | Email, Community |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Free plan (source) |
| Website | cartesia.ai |
| Facts checked | 20 Sep 2026 |
Alternatives to Cartesia Sonic
- ElevenLabsAffordable voice cloning with multilingual generation, dubbing, streaming, and API access.9.4
- Google Cloud Text-to-SpeechA broad, API-only TTS service for developers building voice-enabled products.9.3
- Azure AI SpeechA broad, production-ready TTS platform for teams building voice applications.9.2
See all Cartesia Sonic alternatives →
Also Ranked In
Cartesia Sonic is ranked in 5 of our directories.
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Featured on iTechGuides
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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