Is a small utility, interesting in the first place, the owners of smartphones with AMOLED screens. The point is simple: part of the pixel just turns off and does not participate in the formation of the image on the screen due to this and is energy saving. Of course, we can say that the image becomes more grainy, but given the horse the resolution of the current smartphones it's never been a problem. Note also that inside the app there are paid options that extend the basic features. Have program another feature: minimum brightness from AMOLEDов not too comfortable, and enabled Battery Saver Pixlel these smaller screens hurt the eyes in the dark.