ScreenLighter is a free app for Android that keeps the screen on when specific applications are running on the foreground. The user can select target applications for the Bright and Dim categories. When the app in the Bright category is running, the screen remains on, and when the app in the Dim category is running, the screen stays on with dim light. ScreenLighter sends notifications to the system status bar to indicate that it is active.

ScreenLighter has several features, including auto-start after system boot-up, and it stops itself after the screen is turned off until the user clicks any view on the screen. This ensures that the screen does not stay on if it is turned on by an unexpected notification from some apps, thereby avoiding battery wastage.

Overall, ScreenLighter is a useful tool for those who want to keep their screen on while using specific apps without having to worry about battery drain.