LucenaCoder is a free, local, token-efficiency obsessed coding harness produced by Lucena.One, an applied AI research lab focused on extreme token-efficiency and deterministic outcomes. The primary way to use it is the desktop app, available for macOS, Windows, and Linux: client-side by default, no login, and your keys, chats, and code stay on your machine. Bring an OpenRouter key or any custom OpenAI-compatible endpoint. If you'd rather not install, you can also run npx lucenacoder to launch a workspace in-browser from any folder on your machine, and Browser Lite lives at [https://lucenacoder.com/browser](https://lucenacoder.com/browser). The company site and blog are at [https://lucena.one/](https://lucena.one/). For long-running, hands-off work, try Underboss autonomous (Pro Beta).