(PS: Even though you are using our application to make screen darker, you should reduce the time watching screen in a dark environment.)
The application has two modes:
Â· Default mode: It needs no permissions, but it couldn't cover the status bar and lock screen.
Â· Overlay Status Bar mode: It needs permissions in some systems (Example: MIUI and Android 6.0)
( Enable permission in Android 6.0: "Settings" app - "Apps" - The gear icon - "Draw over other apps" - "Night Screen" - Then enable it )
Otherwise, this application is open source under GNU GPL v3 License.
Github Repo: https://github.com/fython/Blackbulb