Side-by-side

Retell AI vs Cartesia

Retell AICartesia

	Retell AI Build, test, and deploy production-grade AI voice agents that handle inbound and outbound phone calls. Visit	Cartesia Ultra-low-latency, real-time voice AI and text-to-speech built on state space models Visit
Votes	0	0
Pricing	Paid	Freemium
Category	Audio	Audio
Tags	voice-agentcall-automationvoice-ai	text-to-speechvoice-aideveloper-platform
Best for	Developers building custom voice agent products Startups automating support or sales calls Agencies deploying voice agents for clients	Developers building real-time voice applications Conversational AI and voice agent teams Startups needing low-latency TTS at scale
Pros	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) Extensive integration directory including Twilio, CRMs, and calendars	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 Generous free tier for prototyping plus affordable $5 Pro commercial plan
Cons	Headline $0.07/min rate is misleading; real costs run $0.13-$0.31/min Costs stack across LLM, TTS, and telephony, making budgeting complex Enterprise plan is expensive, starting around $8,000 Steeper learning curve for non-developers building advanced flows No permanent free plan, only $10 in starter credits	Credit-based, per-character pricing becomes premium at high volume No self-hosted or on-prem deployment option No mobile app or browser extension; API-first product Less of a consumer content studio than ElevenLabs Free tier is non-commercial only

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