Show HN: A tiny macOS app that turns off the MacBook display [free license]

Blackout is a lightweight macOS app that disables your MacBook's built-in display while using an external monitor, allowing users to focus on the external screen without the internal display appearing in system settings. The app costs $9 (early bird price from $19), works with Apple Silicon and Intel Macs running macOS Sequoia or later, and automatically restores the display if the monitor disconnects or the app closes. It features individual display controls, automatic reset functionality, and maintains TouchID authentication even when the internal display is off.