Cartesia, 20,000 free model credits every month

With standard text-to-speech, each Cartesia model credit corresponds to one character. The 20,000 model credits provided each month can process about 20,000 characters of Sonic-3 speech synthesis. It also offers $1 in prepaid credits for testing voice agent features. Sonic-3 supports more than 40 languages and native voices, emotion control, laughter, and alphanumeric text processing, with latency under 100 milliseconds.

You can use the free plan by signing up for Cartesia, and you do not need to add a credit card when you register. After signing up, you can use model credits for Sonic-3 text-to-speech and prepaid agent credits to test voice agent features.

The free plan is available to all accounts but is for personal use only and does not include commercial usage rights. It includes 1 agent slot and Discord support, while voice cloning is available only on Pro plans and above. Some external posts list 10,000 characters per month, but the current pricing page shows 20,000 credits per month. Cartesia has changed its free allowance several times between 2025 and 2026, so check the pricing page to confirm the 20,000 credits before use.