kitio.aiAdded Oct 29, 2026
Cartesia Sonic
Freemium · $5/moLow-latency text-to-speech API for voice agents
What is Cartesia Sonic?
Cartesia Sonic is a text-to-speech model and API built for real-time voice agents. It starts audio in well under a tenth of a second, covers 44 languages from a single model and can clone a voice from a short sample.
Sonic reads emotional context from the transcript by default and lets you insert non-verbal cues such as laughter directly into the text. Voice cloning works from about ten seconds of audio, and cloned voices can be localised into other languages.
Cartesia also sells speech-to-text and managed voice agents next to Sonic, and all of them draw on the same monthly credits. Developers pay by usage through plans that start free, with higher tiers adding commercial rights and better cloning.
Features
- Real-time speech under 90ms
- 44 languages
- Instant voice cloning
- Emotion and laughter control
- Voice localisation
Tags
Releases
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Cartesia Sonic was added to the directory.
Organization
Cartesia
🇺🇸 United States
Listed by kitio.ai · unverified owner
Pricing
- Pricing model
- Freemium
- Paid options from
- $5/mo
- Billing frequency
- Monthly
Cartesia Sonic plans
Free
Free
- 20K credits per month
- Text to speech and speech to text
- $1 of prepaid voice agent usage
Pro
$5/mo
- 100K credits per month
- Commercial use license
- Instant voice cloning
Startup
$49/mo
- 1.25M credits per month
- Professional voice cloning
- $49 of prepaid agent usage
Scale
$299/mo
- 8M credits per month
- Priority support
- High concurrency limits
Enterprise
Contact sales
- Custom credits and volume pricing
- SSO and DPAs
- Shared Slack channel
Prices in USD, checked Oct 29, 2026. Plans change often, so confirm on the Cartesia Sonic site.Official pricing
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Pros and cons
Pros
- Very fast time to first audio
- Wide language coverage in one model
- Cloning from ten seconds of audio
Cons
- Aimed at developers more than casual users
- Credit system takes a while to understand
- Commercial license needs a paid plan
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Q&A
What is Cartesia Sonic?
Cartesia Sonic is a text-to-speech model and API built for real-time voice agents. It starts audio in well under a tenth of a second, covers 44 languages from a single model and can clone a voice from a short sample.
How much audio is needed to clone a voice?
Instant voice cloning works from about ten seconds of audio. A separate professional cloning option comes with the Startup plan.
Can I use Sonic for commercial projects?
Commercial use is included starting with the Pro plan. The free plan is meant for trying it out.
How much does Cartesia Sonic cost?
Cartesia Sonic is freemium, with paid plans from $5/mo.
Is there a free version of Cartesia Sonic?
Yes. Cartesia Sonic has a free plan, and paid plans add more usage and features.
What are the main features of Cartesia Sonic?
Real-time speech under 90ms, 44 languages, Instant voice cloning, Emotion and laughter control, Voice localisation.
Who makes Cartesia Sonic?
Cartesia Sonic is made by Cartesia.
What are the best alternatives to Cartesia Sonic?
Popular alternatives include Inworld AI, Voicemaker, Lazybird.