Capsomnia is a free, open-source macOS app that turns the Caps Lock key into a physical anti-sleep switch, allowing your MacBook to stay awake and continue running background tasks even when the lid is closed.
Caps Lock keeps your Mac awake, even with the lid closed
- Keep AI agent tasks (Codex, Claude Code) running with lid closed
- Maintain SSH sessions without device sleep
- Complete long builds and large downloads
- Keep mobile coding sessions (Codex Mobile) connected
- Download and install Capsomnia from the official website or GitHub.
- Open the app; it runs as a menu bar application.
- Press Caps Lock to enable anti-sleep mode (LED lights up).
- Close your MacBook lid; tasks continue running.
- Press Caps Lock again to disable anti-sleep and restore normal sleep behavior.
- Optionally configure a custom hotkey in settings if Caps Lock is used for other functions.
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