Cartesia
audio
Ultra-low-latency, real-time voice AI and text-to-speech built on state space models
Pricing
Free plan
Rating
—
Votes
0
Head-to-head comparison
Cartesia vs Retell AI
Compare Cartesia and Retell AI side by side across pricing, features, ratings, pros, cons, best-fit use cases, and alternatives.
Retell AI
audio
Build, test, and deploy production-grade AI voice agents that handle inbound and outbound phone calls.
Pricing
Paid
Rating
—
Votes
0
Feature comparison
Feature
Cartesia
Retell AI
Category
audio
audio
Pricing
Free plan
Paid
Free plan
API access
Mobile app
Browser extension
Team collaboration
Custom training
Self-hosted option
Offline mode
Multi-language support
Cartesia pros and cons
Industry-leading low latency (40-90ms time-to-first-audio) via streaming websockets
Consistent performance even at P99 thanks to SSM/Mamba architecture
600+ voices across 42 languages with speed, volume, and emotion control
Developer-friendly REST and WebSocket APIs with SDKs
Note: Credit-based, per-character pricing becomes premium at high volume
Note: No self-hosted or on-prem deployment option
Note: No mobile app or browser extension; API-first product
Retell AI pros and cons
Transparent per-minute, pay-as-you-go pricing with no platform fee
Full feature access from day one, nothing locked behind higher tiers
Strong developer tooling: API, testing/simulation suite, webhooks, functions
Wide model and voice choice (GPT, Claude, ElevenLabs, Retell voices)
Note: Headline $0.07/min rate is misleading; real costs run $0.13-$0.31/min
Note: Costs stack across LLM, TTS, and telephony, making budgeting complex
Note: Enterprise plan is expensive, starting around $8,000
Which one should you choose?
Best overall signal
Cartesia
Selected using Toolglade popularity signals such as views and votes.
Best value signal
Cartesia
Selected using free-plan availability and engagement signals.
Best for
Cartesia
- Real-time voice agents
- Conversational AI
- Low-latency TTS
- Voice cloning
- Developers building real-time voice applications
Retell AI
- Inbound call automation
- Outbound sales and lead qualification
- AI phone support agents
- Appointment scheduling
- Developers building custom voice agent products
FAQ
Is Cartesia better than Retell AI?
It depends on your use case. Compare category fit, pricing, feature availability, and ratings before choosing.
Which tool has a free plan?
Cartesia and Retell AI may not offer a free plan based on current Toolglade data.