Blacktop

OLED-friendly fullscreen black overlay for Android desktop setups

Some Android desktop modes (Google Pixel, etc.) keep the phone screen powered on while connected to an external monitor. The screen sits face-down or unused, draining battery and wearing out OLED pixels. Blacktop fixes this: one tap sends the display into a pure black fullscreen, cutting OLED power draw to near-zero without actually turning off the screen (which would kill the desktop session).

Covers the entire screen with #000000. On OLED panels, black pixels are physically off — zero light output, minimal power draw. Tap anywhere to exit.

Prevents the display from sleeping while Blacktop is in fullscreen mode. Toggle available in the UI. When the tab loses visibility, the lock is released automatically and re-acquired when the tab returns.

Blacktop ships as a Progressive Web App. Install it to the home screen for standalone, fullscreen launch without browser chrome. Works on Android Chrome and supports iOS Safari via apple-mobile-web-app-capable.

Service Worker caches all assets. Works without a network connection after first load.

Static page. No server, no login, no data collected. Runs entirely in the browser.

# Install dependencies
npm install

# Dev server
npm run dev

# Production build
npm run build

1. Open blacktop on the Android device used as desktop.
2. (Optional) Install as PWA via Install App button.
3. Tap Enter Fullscreen — screen goes black.
4. Tap anywhere to exit.