Gradium

What we know about Gradium

Gradium is a text-to-speech apis platform: real-time voice-agent infrastructure play: WebSocket-first streaming TTS in 5 European languages with instant cloning, on-device models (Phonon), and credit-based pricing. Active and well-funded (site announced funding extension to $100M, July 2026). This profile tracks what we have verified about Gradium, each fact linked to a primary source and dated.

On pricing, Gradium starts at $13 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 Gradium 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, Gradium covers streaming audio output, realtime websocket api, instant voice cloning, professional voice cloning, ssml support, and word-level timestamps, and does not offer commercial use on free tier. Each of those is verified against Gradium's own docs or dashboard, not marketing copy.

In total we track 21 verified facts for Gradium 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 Gradium fact sheet below, and each row links the primary source it came from so you can check our work.

Whether Gradium 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 Gradium actually fares against the platforms buyers most often weigh it against.