Toggle Light and Dark Mode with a global shortcut. Part of Domus.
A shutter is the hinged leaf over a window. Swing it open and the room is daylight, close it and the room is night. Shutter does the same for the Mac: one keystroke (⌃⌥⌘D out of the box, yours to change) flips the whole system between Light and Dark Mode, from anywhere. A click on the menu bar icon does it too.
On a MacBook it can also follow the light in the room: Dark Mode when the room gets dark, Light Mode when it gets bright again. One slider sets how dark is dark, and a mode you pick by hand stays until the light changes again.
Shutter lands on the same appearance switch System Settings uses, so the change is instant and animated by the system itself. The shortcut is a plain Carbon hotkey, no event tap, no Input Monitoring, no Accessibility. The app asks for no permissions at all.
Following the light reads the same ambient light sensor auto-brightness uses, every two seconds while the setting is on. Dark means darker than the slider's point, light means four times brighter than that, and the light has to stay there for 10 seconds before anything changes, so a passing shadow does nothing. The sensor can't see with the lid closed, so readings pause until it opens. On a Mac without a built-in sensor the setting stays off.
./Scripts/dev.sh # rebuild-and-relaunch loop
./Scripts/test.sh # unit tests
./Scripts/bundle.sh # assemble build/Shutter.appRequires macOS 26 or later.
MIT, see LICENSE. Bundled third-party software and its licenses are listed in THIRD-PARTY-NOTICES.md.