Someone Was Here
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MacTap
Knock on your MacBook to trigger shortcuts, using its built-in motion sensor
It turns a sensor already inside recent MacBooks into free, local hotkeys you can hit without looking at the keyboard.
MacTap is a menu bar app that listens to the MacBook's motion sensor for knocks on the chassis. One, two or three knocks map to actions such as copy, paste, screenshots, play/pause or AI actions, and a left-and-right mode lets each side of the trackpad do different things. It runs entirely on-device, is MIT-licensed, and needs an M2 or later MacBook (or M1 Pro/Max) on macOS 14.6+.
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