There are a few similar apps for Android, you can find most linked from here: Screen Filter https://play.google.com/store/apps/details?id=com.haxor https://pla

There are a few similar apps for Android, you can find most linked from here: Screen Filter https://play.google.com/store/apps/details?id=com.haxor https://play.google.com/store/apps/details?id=com.haxor I only use that Screen Filter app to shut off the soft-key backlights since last time I tried it all it did was drop a configurably-transparent black over everything on-screen.