PlayHT has shut down. Move your voice app to Cartesia.

PlayHT shut down at the end of 2025. Cartesia's Sonic 3.6 ranks first on independent blind listening tests, in 44 languages, with first audio in under 90ms.

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Why teams choose Cartesia

Rated first by listeners

Sonic 3.6 ranks first on the Artificial Analysis Provider Voice Arena, a blind listening test.

First audio in under 90ms

Sonic streams speech fast enough for a live phone call, on the public API.

44 languages, one model

Native accents in every language, with no model to switch when a caller does.

Enterprise ready

SOC 2 Type II, HIPAA-eligible, on-prem and air-gapped deployment, and a 99.9% uptime SLA.

How they stack up

Rebuild the voice you lost from 10 seconds of audio

PlayHT voice IDs stopped working when the service shut down, so the voice itself has to be made again.
Cartesia makes an instant clone from 10 seconds of a recording you have permission to use, or a professional clone from 30 minutes, both on the public API.

Most teams switch in one to two weeks

Cartesia is integrated with the major voice agent platforms, and every model is on the public API.
Sonic streams over WebSocket, with first audio in under 90ms.

Trusted by leading enterprises. Speaking from experience.

Discover success stories

“Cartesia’s state-space models bring enterprise-grade speed and quality to our AI Voice Agents… making it possible for businesses to deploy secure, scalable voice agents that can understand, act, and adapt in real time.”

Ravi Krishnamurthy

VP Product

“With Cartesia's Sonic model, users can interact with a wide range of high-quality, human-like voices in multiple languages, enhancing their experience on our platform.”

Spencer Chan

Head of Poe Product

“Cartesia is leading the charge of building efficient, multimodal models from first principles, starting with their Sonic TTS model.”

Vipul Ved Prakash

CEO

“We didn’t switch to Sonic because it was incrementally better, we switched because nothing else came close… we’ve seen a 2.9% lift in our conversion and a 12.2% increase in customer engagement.”

Akshay Ramaswamy

Staff Product Manager

“Sonic represents a significant evolution over previous TTS models, delivering refined prosodic rhythm, natural intonation, superior pacing and wider emotional range for more “human” sounding voices.”

Tyler Brown

Voice Expert

“Cartesia Sonic is the best voice model today for real-time multimodal use cases.”

Kwindla Hultman

CEO

Frequently asked questions

Is PlayHT still available?

No. PlayHT shut down at the end of 2025, and its API and stored voices went offline with it. Cartesia's Sonic 3.6 is on the public API today, in 44 languages.

Can I bring my PlayHT voice to Cartesia?

Not the PlayHT voice ID, which stopped working with the service. If you have the original recording and permission to use it, Cartesia makes an instant clone from 10 seconds of it, or a professional clone from 30 minutes. See the cloning guide.

How long does it take to switch to Cartesia?

One to two weeks for most teams. Cartesia is integrated into the major voice agent platforms and every model is on the public API, so there is no platform to move onto and nothing to unpick later.

How does Cartesia sound compared with other voice APIs?

Sonic 3.6 ranks first on the Artificial Analysis Provider Voice Arena, where listeners compare two clips without being told which model made either. See how it compares with the providers teams move to next.

Which languages does Cartesia support?

44 languages from one model, with native accents calibrated per region. Hear them.

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