Cartesia vs Retell AI: Which Is Better for Your Team in 2026?
Cartesia and Retell AI are both used for ai voice agents. Below we compare them on pricing, AI capabilities, compliance, and the use cases each one fits best — all from verified vendor data.
Choose Cartesia if…
- Voice agent platform builders (Vapi, Retell, LiveKit) embedding best-in-class TTS/STT as a component
- Enterprise teams in healthcare and finance who need HIPAA + PCI compliance with sub-100ms latency
- Teams building multilingual agents across 42 languages including Indian-language markets
- Developers who want to own the full stack via Line and avoid LLM and telephony lock-in
Choose Retell AI if…
- Healthcare and financial-services inbound with strict compliance requirements
- Developer or CX teams wanting managed platform without Vapi's setup overhead
- Multilingual inbound agents across 8+ languages
Cartesia vs Retell AI: feature comparison
| Feature | Cartesia | Retell AI |
|---|---|---|
| At a glance | ||
| Category | AI voice agent platform | AI voice agent platform |
| Best fit | Smb, Mid market, Enterprise | Smb, Mid market, Enterprise |
| Deployment | Cloud, Private cloud, On premise | Cloud |
| Channels | Voice, Web chat | Voice, Web chat, SMS, Email |
| Pricing & ratings | ||
| Starting price | Contact sales | From $0.07/min |
| Free trial | No | No |
| User rating | — | 4.8/5 (47 G2 reviews) |
| AI capabilities | ||
| Autonomous voice agent | Yes | Yes |
| Real-time agent assist | No | No |
| Conversation intelligence | No | Yes |
| Automated QA | No | Yes |
| Intelligent routing | No | Yes |
| Compliance | ||
| SOC 2 Type II | Yes | Yes |
| HIPAA | Yes | Yes |
| PCI DSS | Yes | No |
| GDPR | Yes | Yes |
Cartesia vs Retell AI: frequently asked questions
- What is the difference between Cartesia and Retell AI?
- 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. By contrast, Best latency and voice quality for inbound at production scale. Expanded to chat, SMS, and email in January 2026. Still seed-funded at $40M+ ARR, which is unusual—and signals strong unit economics.