Cartesia
Cartesia builds speech models and the voice agents that run on them, aimed at teams putting live conversation into products and contact centers.
Best for Developers building low-latency voice agents and real-time speech features
- Starts at
- $5/month flat
- Free plan
- Yes
- Price checked
- 2026-10-19
Pricing
Price checked: 2026-10-19. Source: official pricing page.
Free plan: 20K credits/month and $1 prepaid agent balance; commercial-use license starts on Pro
| Plan | Monthly | Annual (per month) | Billing unit | Notes | Source |
|---|---|---|---|---|---|
| Pro | $5 | Not listed | flat | 100K credits/mo; commercial license; instant voice cloning | Source |
| Startup | $49 | Not listed | flat | 1.25M credits/mo; pro voice cloning | Source |
| Scale | $299 | Not listed | flat | 8M credits/mo | Source |
| Enterprise | Not listed | Not listed | flat | Custom; contact sales | Source |
"Not listed" means the official page shows no list price for that billing period (often contact sales). We never fill gaps from third-party sites.
Overview
Developers call Sonic for text-to-speech, Ink for speech-to-text and Managed Agents for phone bots that can take or make calls, with provisioned numbers and concurrency limits that grow by plan. The company leans on state space model research to keep latency low enough for natural back-and-forth, and markets coverage of 44 languages. Plans bundle a monthly credit pool for the speech models plus a prepaid balance for agents, so one subscription covers both. Voice cloning comes in instant and professional forms on higher tiers. Limitation: commercial use is excluded until you pay, and agent minutes and telephony are billed on top, so call-heavy deployments need careful forecasting. Regulated industries should confirm DPA or BAA terms, which sit on Enterprise.
Key features
- Low-latency text-to-speech and speech-to-text
- Managed phone voice agents
- Monthly credits plus agent balance
Limitations
The free plan has no commercial-use license. Agent calls and phone time are billed per minute on top of plan credits.