Gradium

Gradium is a voice AI platform that provides developers with APIs for text-to-speech, speech-to-text, and voice cloning. It is designed specifically to add voice capabilities to AI agents and other real-time applications. The core offering is a set of production-ready models that handle the complexities of natural, expressive speech generation and accurate speech recognition, with a focus on low latency and scalability.

The platform stands out with its real-time streaming capabilities. Its text-to-speech delivers word-level timestamps for perfect audio-text sync, while its speech-to-text includes semantic voice activity detection to enable smart turn-taking in conversations. A notable feature is instant voice cloning, which can create a usable voice model from just 10 seconds of audio. The infrastructure is built on WebSocket APIs, with SDKs in Python and Rust, and integrations for major agent frameworks like Livekit and Pipecat.

Gradium is for developers and teams who are building interactive AI agents, customer service bots, or any application where a natural, responsive voice interface is needed. Its predictable pricing, which includes a free tier with API access, and its support for multiple languages within a single voice model make it a practical choice for projects that need to scale from prototype to production.