Supertone API

What we know about Supertone API

Supertone API is a text-to-speech apis platform: expressive character voices (games, content, Korean/Japanese/English markets first, now 31 languages via Supertonic 3) on cheap credit-based subscriptions from $2.99/month; uniquely pairs the hosted API with the open OpenRAIL-M Supertonic model for on-device synthesis. This profile tracks what we have verified about Supertone API, each fact linked to a primary source and dated.

On pricing, Supertone API starts at $2.99 per month for its entry tier. That is the sticker rate: real production cost usually runs higher once you add a language model, a voice provider, and telephony minutes. Every Supertone API comparison on the site works from that all-in figure rather than the headline number, because the headline number is rarely what the invoice says.

On capabilities, Supertone API covers streaming audio output, instant voice cloning, emotion / style controls, and self-host / on-prem option, and does not offer realtime websocket api. Each of those is verified against Supertone API's own docs or dashboard, not marketing copy.

In total we track 15 verified facts for Supertone API today, and add coverage as the ingestion pass revisits it. Where a number is a vendor claim rather than our own measurement, it is labeled as such on the Supertone API fact sheet below, and each row links the primary source it came from so you can check our work.

Whether Supertone API is the right call depends on your use case more than any single spec, which is why the head-to-head verdicts below score it per scenario rather than crowning one overall winner. Use the fact sheet for the raw numbers, and the matchups for how Supertone API actually fares against the platforms buyers most often weigh it against.