EasyEyes
Features:
* Simplicity of one click on/off.
* Temperature Filter – Turn the blue gaze of your device with warm lighting.
* Brightness Filter – Set the brightness level below minimum brightness.
* Lowest System Brightness – Set the system brightness to the lowest setting.
https://play.google.com/store/apps/details?id=com.palmerin.easyeyesfree&hl=en