You can adjust color and brightness of your screen. You can protectyour screen from prying eyes with the filter. This app is ad-free.This app can create multiple filters, and quickly switch betweenthem by using shortcut icons. Red, blue, green, and gray filtersare included in this app, so you can use them easily. Of course,colors and opacity are customizable. This app keeps CPU usage lowwhen the filters are activated. The filters may be disabledsometimes by Android design. This app recovers the filters inseconds.