Choose Cartesia if you need
No checked fact sets Cartesia apart from Retell AI yet.
At a glance
- Cartesia has a free plan. We haven't confirmed one for Retell AI.
- Cartesia's lowest paid plan is Pro at $5 per month, as of October 20, 2026.
- Retell AI's lowest paid plan is Pay as you go at $0.07 per minute for AI voice agents, from $0, as of October 20, 2026.
- Both are available on API.
- Only Retell AI lists Web.
- Both work with Twilio.
- Both list SOC 2 and SSO.
- Only Retell AI lists ISO 27001, GDPR and HIPAA.
- Both have a public API.
- Cartesia can be self-hosted. We haven't confirmed that for Retell AI.
From each tool's own website, checked on the dates below, and from published reviews.
Which to choose
From the facts checked for both tools, not from opinion. A fact we haven't confirmed for one of them is never counted.
Choose Retell AI if you need
- Web. We haven't found it on Cartesia's website.
- Integration with Salesforce, HubSpot or Zapier. We haven't found them on Cartesia's website.
- ISO 27001, GDPR or HIPAA. We haven't found them on Cartesia's website.
Cartesia
Nobody has reviewed Cartesia yet. Its rating shows once it has 3 reviews.
Review Cartesia
Retell AI
Nobody has reviewed Retell AI yet. Its rating shows once it has 3 reviews.
Review Retell AIThe facts
- What it does
- CartesiaVoice agents that answer and make calls, and the speech models behind them, in one API
- Retell AIBuild, deploy, and manage AI voice agents that sound human, execute tasks, and scale
- Free plan
- CartesiaYes
- Retell AINot confirmed
- Pricing
- CartesiaMonthly plans with usage credits
- Retell AIUsage-based
- Paid plans from
What they share
From the platforms and integrations each website lists.
Platforms
Both
- API
Only CartesiaNothing else listed
Only Retell AI
- Web
Integrations
Both
- Twilio
Only Cartesia
- LiveKit
- Pipecat
- Genesys
- Rasa
People who switched
Reviewers who say they used one of these before the other.
No reviewer has said they moved between Cartesia and Retell AI yet.
Used either of them?
Your review makes this comparison better for the next person. Review Cartesia or review Retell AI.