Black Screen is an Android app developed by KTK Tools that allows you to change your screen to black for a brief time or set it permanently as your wallpaper. This app is perfect for those who want to save battery life or reduce eye strain. With Black Screen, you can select the shade of black for your screen by changing a slider.

One of the best features of the app is the Quick Change mode, which allows you to activate the black screen for a brief time. To go back to your previous screen, simply press the back button twice. The app is easy to use and has a simple interface, making it accessible to anyone. If you're looking for a simple and effective way to change your screen to black, Black Screen is the app for you.