Lumen

Lumen is an AI desktop assistant that operates directly on top of your existing workspace. By triggering a global hotkey (Ctrl+Space on Windows or Cmd+Space on macOS), users can instantly select any region of their screen—such as code blocks, math formulas, complex diagrams, or dense text—to analyze and solve without switching windows.
Rather than relying on manual copy-pasting or traditional screenshot steps, Lumen captures pixel-accurate context ephemerally to generate immediate, actionable solutions directly over your current application.