LucenaCoder is a free, local, token-efficiency obsessed coding harness built by Lucena.One, an applied AI research lab focused on extreme token-efficiency and deterministic outcomes. Download the desktop app for Mac, Windows, or Linux; it's client-side by default with no login, best paired with an OpenRouter key or a custom OpenAI-compatible endpoint, so your keys, chats, and code never leave your machine. Prefer to stay in the browser? Run npx lucenacoder to launch a workspace from any folder on your machine. For long-running tasks, switch to Underboss autonomous (Pro Beta).