I found all of the apps of this sort on android were sorely lacking. None of them actually adjusted the screen warmth, they just put an "always on" semi-transpa

I found all of the apps of this sort on android were sorely lacking. None of them actually adjusted the screen warmth, they just put an "always on" semi-transparent overlay on the center of the screen. If you have software keys on your device, this becomes immediately obvious because the keys don't have the overlay and appear really bright Such a shame, but I don't think APIs are available to developers for this purpose