Cartesia Free Plan
Free plan: 20,000 credits and $1 prepaid voice agent credits every month
What you get from Cartesia Free Plan for free
Overview
Cartesia offers a perpetual Free tier designed for developers prototyping ultra-fast, real-time voice and speech applications. It renews monthly at $0 and provides recurring credits for text-to-speech, speech-to-text, and managed conversational voice agents.
What is Included
The Free plan includes recurring monthly allowances across Cartesia's core speech intelligence stack:
- Model Credits: 20,000 credits refreshed monthly.
- Prepaid Voice Agent Balance: $1.00 per month for managed agent telephony and runtime.
- Text to Speech (Sonic-3.6): Approximately 27 minutes of generated audio per month, supporting up to 2 concurrent requests.
- Speech to Text (Ink-2): Approximately 1 hour and 51 minutes of audio transcription per month, supporting up to 8 concurrent requests.
- Managed Voice Agents: Up to 8 concurrent calls and 1 Cartesia-provisioned phone number. Calls run at a standard rate of $0.06 per minute (deducted from prepaid agent funds).
- Workspace Seats: Unlimited workspace seats on all plans.
- Promotional Access: LLM usage during calls for UI-created agents and automated evaluations are free of charge for a limited time.
Usage Limits & Considerations
- Non-Commercial Use: The Free plan is intended for evaluation and testing; commercial usage licenses require upgrading to the Pro plan ($5/mo) or above.
- Voice Cloning: Instant and professional voice cloning require paid subscription tiers.
- Concurrency: Fixed at 2 concurrent TTS requests and 8 concurrent STT or voice agent connections.
Models served free
Limits as the provider publishes them; a dash means none is published.
History
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Understand it
A few minutes of play-along, no sign-up.
- How does it turn text into a voice that sounds human? · Text-to-speech: phonemes, prosody and the waveform · 5 min
- How does it turn my voice into text? · Speech-to-text: spectrograms and audio tokens (Whisper) · 5 min
Compared in
More free API credits
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