DoctorFilter Blue Light Filter - Free Download

DoctorFilter is a blue light filter and screen dimmer for Android. It adds an adjustable warm tint over your screen so you can cut blue light and brightness in the evening, with controls that show exactly what they do.
★ Warm colour in Kelvin – from daylight 5500 K down to candlelight 1850 K, with separate filter density.
★ Extra Dim – darken the screen below the lowest system brightness.
★ Night mode schedule – turns on and off automatically, even after a restart.
★ Seven presets: Daylight, Office, Evening, Warm bulb, Reading, Night, Candle – plus your own.
★ Quick control – notification panel, Quick Settings tile, home screen widget.
★ Honest numbers – an estimate of the relative change in melanopic light, based on published lighting science; not a measurement of your display.
★ 20-20-20 break reminder, light and dark themes, 71 languages.

Private by design: open source, no account, no server, no analytics.

Open source (GPL-3.0): anyone can read the full code on GitHub – github.com/XPersPective/doctorfilter

Free with ads after an introductory period (a consent screen appears where required). A one-time Pro purchase removes ads and unlocks unlimited presets, multiple schedules, full notification control and settings backup. No subscription. Pro is a lifetime licence: pay once, keep it forever.

DoctorFilter is a screen comfort tool, not a medical device. It does not diagnose, treat or prevent any condition.