Android 5.0+
Since Android 8.0, it can only run on one simple mode due to API changes.
从 Android 8.0 开始，由于 API 改动，它只能运行在一个简易的模式
a Material Design Android app which can prevent your eye from being hurt by screen light.
一个能减少屏幕光线对眼睛造成伤害的 Material Design 风格 Android 应用程序。
Open source with love~
(Screenshot is out of dated. You can download latest version and try it.)
GNU GENERAL PUBLIC LICENSE Version 3, 29 June 2007
Copyright (C) 2016 Paper Airplane Dev Team
This program comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it under certain conditions.