Million

Open-source developer tools, datasets, and RL environments to help people and AI agents build a better web.

Million: Early access, open to join. Get it at million.dev.

Million builds open-source developer tools, datasets, and reinforcement learning environments designed to fix the web. The company develops tools like React Doctor and React Scan, which developers use to find and fix performance issues in web applications. Alongside these tools, Million builds ReactBench with custom datasets, RL environments, and traces to train and evaluate frontier coding agents on realistic web development tasks. Backed by Y Combinator (W24) and notable investors including Evan You and Amjad Masad, Million aims to democratize software quality so anyone can ship applications rivaling those built by the best-funded engineering teams.