Closed lid
Keeps work running with the lid closed
Turn Caps Lock on, close the MacBook, and local jobs keep running. Your Mac can remain reachable over SSH when remote login and networking are available.
Give Caps Lock
a real job
Caps Lock becomes a physical keep-awake switch. Flip it on, close the lid, and let your background work keep running.
Apple silicon · macOS 14 Sonoma+ · Signed & notarized · Open source
Caps Lock on
Runs pmset -a disablesleep 1 — sleep is disabled.
Caps Lock off
Runs pmset -a disablesleep 0 — normal sleep behavior.
A physical switch for AI agents
Flip Caps Lock on, close the lid, and let long-running local work continue. Capsomnia keeps your MacBook awake until you turn it off. The Caps Lock LED shows the sleep-prevention state at a glance.
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AI agents
Keep long Codex or Claude Code tasks running with the lid closed.
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SSH sessions
Drive your Mac remotely without it dropping into sleep mid-session.
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Builds & downloads
Long compiles and large downloads finish on their own time.
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Mobile connections
Keep Codex Mobile and other mobile sessions connected so work does not stop.
Features
Keep your Mac working after the lid closes
Capsomnia is a small Mac app focused on closed-lid continuity, physical status visibility, and transparent open-source design.
Physical state
The Caps Lock LED shows status
When the light is on, sleep prevention is on. You can check the state from the keyboard and keep your menu bar clean.
Open source
Completely free, open-source design
Released under the MIT License. You can inspect the source, package install scripts, helper commands, and security model before installing.
Security model
The menu bar app runs as the current user — never as root. Changing system sleep settings needs elevated privileges, so Capsomnia uses one small, fixed, root-owned helper through passwordless sudo.
- No network requests
- No telemetry
- No accounts
The app can only invoke
sudo -n /Library/PrivilegedHelperTools/capsomnia-pmset on
sudo -n /Library/PrivilegedHelperTools/capsomnia-pmset off
sudo -n /Library/PrivilegedHelperTools/capsomnia-pmset display-sleepThe package keeps the app, helper, and system LaunchAgent root-owned. The sudoers rule is limited to these three exact commands.
The helper only ever runs
/usr/bin/pmset -a disablesleep 1
/usr/bin/pmset -a disablesleep 0
/usr/bin/pmset displaysleepnowIt accepts on, off, and display-sleep and nothing else.
No Input Monitoring
Capsomnia does not read keyboard events. It checks only the local Caps Lock state every 250 milliseconds.
Background item prompt
macOS may show “Taketo Fujimaki” as a background item. This is the LaunchAgent that starts Capsomnia at login and recovers after crashes.
Quitting the app restores normal sleep behavior. Sleep-disabled closed-lid use can increase heat and battery drain — mind airflow, power, and runtime.