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Real-time voice AI: Sonic text-to-speech and Ink speech-to-text
Updated
Cartesia is a voice AI platform that provides text-to-speech, speech-to-text and voice agents. Its main products are Sonic for speech synthesis, Ink for transcription and Managed Agents for phone-capable voice agents.
Developers send text to Sonic through the API to receive streamed speech, send audio to Ink for transcripts, or assemble both with an LLM into a Managed Agent that answers phone calls. Usage draws down monthly credits, and higher plans raise concurrency limits and unlock voice cloning options.
Cartesia is used by developers and product teams building voice assistants, call-handling agents and apps that need fast, natural speech output. Startups can begin on the free tier, while larger deployments use the Scale or Enterprise plans.
Cartesia has a Free plan with 20K credits per month, Pro at $5 per month with 100K credits, Startup at $49 with 1.25M credits, and Scale at $299 with 8M credits. Enterprise is custom. TTS uses roughly 750 to 800 credits per minute, and voice agents cost $0.06 per minute.
Alternatives include ElevenLabs, which offers a broader voice library and dubbing tools, Deepgram, which is strong in speech-to-text and voice agent APIs, and PlayHT, which focuses on voice cloning and text-to-speech.
Pricing Model
FREEMIUM
Starting Price
$5/mo
Free Options
Free version
| Feature | Free | Pro | Startup | Scale | Custom |
|---|---|---|---|---|---|
| 20K monthly credits | , | , | , | , | |
| TTS and STT basics | , | , | , | , | |
| $1 agent credit | , | , | , | , | |
| 100K monthly credits | , | , | , | , | |
| Commercial use | , | , | , | , | |
| Instant voice cloning | , | , | , | , | |
| 1.25M monthly credits | , | , | , | , | |
| Professional voice cloning (2 slots) | , | , | , | , | |
| Organizations | , | , | , | , | |
| 8M monthly credits | , | , | , | , | |
| Priority support | , | , | , | , | |
| High concurrency | , | , | , | , | |
| Custom limits | , | , | , | , | |
| DPAs and SSO | , | , | , | , | |
| Security support | , | , | , | , |
Other
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API Types
SDK Availability
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Developer Features
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Compliance Standards
SOC 2 Type II
EnterpriseISO 27001
EnterpriseGDPR Compliant
GlobalHIPAA
HealthcarePCI DSS
FinanceCCPA
PrivacyFedRAMP
GovernmentCSA STAR
CloudDeployment & Data
Data Residency Options
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AI voiceover studio with commercial rights on paid plans
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