MacBook Alarm: A Guard Dog For Your Mac

No app, no App Store, no permissions dialogs. Open a page in Safari or Chrome, set a secret knock, and your MacBook bites back.

Why Mac users especially need this

MacBooks wake instantly and beautifully — which means the coworker who taps your trackpad is looking at your messages in under a second. macOS keeps decent wake logs (pmset -g log shows every lid-open), but logs only tell you afterwards, and only if the machine was asleep. An armed alarm tells you the moment it happens.

Works with every Mac browser

The alarm, the stealth clock and the secret knock run identically in Safari, Chrome, Firefox, Arc and Edge on macOS — on MacBook Air, MacBook Pro, iMac and Mac mini alike. There’s nothing to install from the App Store, no permission dialogs, no menu-bar agent: it’s a web page, and every feature is browser-agnostic.

Mac-specific guard duty tips

Real security first: Ctrl + Cmd + Q locks your Mac instantly — use it when the stakes are real, and the alarm when you want the snoop caught rather than merely blocked. Keep the lid open while armed: the alarm guards an awake machine (that's the state snoops exploit). Stealth mode looks convincingly like a Mac screensaver clock — every touch is silently timestamped, and your secret corner-knock unlocks the report.

Suspect it already happened?

Check last in Terminal for logins, pmset -g log | grep -i wake for lid-opens, and Recent Items — then read the full guide to telling if someone touched your laptop, including why a moved cursor leaves no trace on macOS.

MacBook alarm FAQ