Blackout: Small macOS App Turns Off MacBook Display When Using External Monitors

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A developer has released Blackout, a roughly 2 MB macOS app that turns off the MacBook's built-in screen while the user works on external monitors. Unlike simply dimming brightness to zero, it switches the display off through Apple's hardware API and removes its desktop, leaving a single large monitor setup. The app includes a fallback that restores the screen if external monitors are disconnected or the app crashes, and keyboard, touchpad, and TouchID remain functional. It is a paid app at $9, though the developer offers free lifetime licenses to users who DM them or submit feedback on how it works with their setup.

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