Capsomnia turns Caps Lock into a physical switch that keeps your MacBook awake. Keep Claude Code, Codex, other AI agents, SSH sessions, builds, downloads, and more running after you close the lid.
If Caps Lock is already assigned, choose another shortcut. The Caps Lock light still shows whether Capsomnia is active.
The app is free and open source, signed and notarized. No accounts or telemetry.
We’ve already seen strong interest in Japan: 2.3M+ views and 6,000+ downloads.
Hey everyone quick heads up before tomorrow's launch (July 25, 4:01pm JST / 12:01am PT).
I built Capsomnia because I kept closing my MacBook mid-SSH-session, mid-build, or mid-AI-agent-run and losing all the progress. Turns out Caps Lock is basically dead weight on a Mac keyboard, so I repurposed it: toggle it on, and your Mac keeps running even with the lid closed.
