UnoRouter

UnoRouter is a free AI model API for side project builders that removes the usual first hurdle of adding a card to every vendor before writing a single prompt. Create an account, generate a key and call the free models from any OpenAI-compatible library or from Claude Code, Cline and OpenCode. When a project needs a stronger model, top up a balance and keep the same key and code; billing is per use and there is no subscription to remember. Behind the key, requests can travel over several upstream routes, so a provider hiccup turns into a retry on another route instead of a broken demo. The whole project is open source on GitHub, and the web chat keeps your history inside your browser.