Keep Screen On is a free Android app developed by Dionis, falling under the category of Utilities & Tools. The app is designed to keep the screen backlight switched on permanently and offers the option to keep the keyboard backlight switched on (only for some phone models).

To use the app, simply open it and toggle the checkbox "Keep backlight on" to enable/disable the application. You can also select the appropriate backlight options.

This app is simple, stable, and lightweight, running on all Android devices without any ads. However, it should be noted that the application will not be updated with any additional functionality, only bugfixes.