Using on LG G2, running on Android 4.4.2 I've been using F.lux for OSX for more than a year now, and I'm so glad I found Darker , a pretty good free F.lux alternative for Android. F.lux's automatic dimming feature is available with the pro version, but the free one works more or less for me. Normal lighting: Settings I normally use at night: What it looks like with Darker on: Color filter options: Get it from Google Playstore: Free | Pro
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