I would like to recommend you an application with large number of downloaders. 30,000+ users downloaded Sleep Helper latest version on 9Apps for free every week! Fortunately, It's easy to get this popular app. This hot app was released on 2017-07-09. Here are some guides of this app:
Running the app will block the blue light and the green light, helping you to release melatonin.
If you press the start button, the filter will turn off after 4 hours and the brightness will be adjusted.
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9Apps 4.9
