Turn Off Screen is a free Android app developed by NDT, available on the Google Play Store under the Utilities & Tools category. This app provides a simple and convenient way to turn off the screen of your Android mobile device with just one click. It is a lightweight and easy-to-use application that requires no complex configurations or settings.

Once installed, you can add the Turn Off Screen widget to your home screen, and with just one click, the screen of your device will turn off. The app uses the Device Administrator permission, which allows it to lock the screen of your device. However, to uninstall the app, you need to disable the Device Administrator permission first. This can be done by going to "Settings" -> "Security" (or "Location & security") -> "Device administrators" -> uncheck "Turn Off Screen," and then you can uninstall the app as usual.

Overall, Turn Off Screen is a simple and useful app that does exactly what it promises - turning off your Android device's screen with just one click. If you're looking for a quick and easy way to conserve battery life or simply want to turn off your screen quickly, then Turn Off Screen is definitely worth a try.