AI Voice Agent Platform
C
Cartesia
Real-time TTS/STT infrastructure and Line voice agent platform — built on State Space Models for sub-100ms latency
Fastest TTS/STT infrastructure in the category — Sonic-3 at 90ms, Ink at 66ms TTCT. Line adds a full agent layer on top. Infrastructure-first but increasingly a finished platform.
Pricing
Contact sales for pricing
Credit-based: Free 20K/mo; Pro $4/mo 100K; Startup $39/mo 1.25M; Scale $239/mo 8M; Enterprise custom. TTS 15 credits/sec; STT 1 credit/sec ($0.13/hr on Scale); Line agents $0.06/min. LLM usage free (limited). Billed annually.
Free tier
Usage-based Flat monthly Custom enterprise
View pricing page →
Verified April 2026
Capabilities
| Capability | Cartesia |
|---|---|
| Transcription | ✓ |
| Summarization | ✗ |
| Sentiment Analysis | ✗ |
| Real-Time Agent Assist | ✗ |
| Autonomous Voice Agent | ✓ |
| Virtual Agent (Chat) | ✗ |
| Conversation Intelligence | ✗ |
| Automated QA | ✗ |
| Intelligent Routing | ✗ |
| Predictive Dialer | ✗ |
| Voice Cloning | ✓ |
| Multilingual | ✓ |
| Coaching Workflows | ✗ |
| Workforce Management | ✗ |
Median voice latency: 90ms source
Compliance & Security
Integrations
Helpdesk
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AI Models
openaianthropicmeta llama
Other
VapiLiveKitPipecat
API documented
Alternatives to Cartesia
Frequently asked questions about Cartesia
- What is Cartesia?
- Fastest TTS/STT infrastructure in the category — Sonic-3 at 90ms, Ink at 66ms TTCT. Line adds a full agent layer on top. Infrastructure-first but increasingly a finished platform.
- How much does Cartesia cost?
- Cartesia does not publish standard per-seat pricing — plans require a custom quote. Credit-based: Free 20K/mo; Pro $4/mo 100K; Startup $39/mo 1.25M; Scale $239/mo 8M; Enterprise custom. TTS 15 credits/sec; STT 1 credit/sec ($0.13/hr on Scale); Line agents $0.06/min. LLM usage free (limited). Billed annually.
- What security and compliance certifications does Cartesia have?
- Cartesia is compliant with SOC 2 Type II, HIPAA, PCI DSS, and GDPR. A Business Associate Agreement (BAA) is available for healthcare deployments.
- What channels does Cartesia support?
- Cartesia supports voice and web chat.
- What are the top alternatives to Cartesia?
- Alternatives to Cartesia include Elevenlabs, Retell, Vapi, Bland, and Synthflow. See the alternatives section above for full profiles of each.