Night Owl

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Night Owl is a nifty application that helps protect your eyes at night against the bright light from your phone’s screen. Read more about Night Owl  

The app comes with a feature for dimming the brightness of your phone’s display and a shortcut in the notification shade so you can adjust the light easily. Moreover, it comes with tools for setting the app to automatically start or stop at a certain hour of the day or night.
 
It comes with advanced filtering tools, you can change the color of the filter, but only a blue-light filter is available. Still, you can adjust the RGB value of the filter and pick from red, green or blue. In addition, the app can be hidden from the status bar and you can set it to start on boot, but this feature won’t work if you move the app to the SD card.