Capsomnia is a small, open-source macOS app that repurposes the Caps Lock key as a toggle for preventing sleep. When enabled, it runs pmset disablesleep so background work continues even with the lid closed; the Caps Lock LED provides instant physical feedback. It is designed for AI coding agents, SSH sessions, builds, downloads, and any unattended local tasks that would otherwise be interrupted by macOS sleep behavior.
Capsomnia sits in PulseGate's Developer Tools category. MacBooks going to sleep during long-running local AI, build, or SSH tasks when the lid is closed. Capsomnia is a consumer product aimed at developers. Capsomnia costs nothing to use. The product ships for the web and macOS.
fuji-mak builds and maintains Capsomnia, and the product first shipped in 2026. The project is developed in the open on GitHub with 273 stars and 157 commits in the last 90 days. Among its 5 catalogued features are Lid-closed Operation, Physical Switch, and LED Status. The interface is available in 4 languages, including English, Japanese, and Korean.
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fuji-mak/Capsomnia verified by the PulseGate indexer
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