f.lux (preview, root-only)

6.64K reviews
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About this app

f.lux removes the bright blue colors from your phone to help you wind down at night and returns your screen to normal the next day. This preview version is not a final release. It requires a rooted phone, and otherwise it will not do much. We appreciate your help with bug reports and feature questions.

Most rooted Lollipop and Marshmallow devices (5.x and 6.x) will work.
Some rooted Kitkat (4.x) devices will work, but many do not.

Known issues:
- Many Samsung Galaxy devices do not work
- Your screen will flash anytime an app is updated through Google Play

Also, if you want to uninstall, do one of these things:
- Disable f.lux before uninstalling
- Reboot after uninstalling
Updated on
Mar 15, 2016

Data safety

Developers can show information here about how their app collects and uses your data. Learn more about data safety
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6.64K reviews
Dave Richards
March 19, 2022
Works as advertised with root. Actually eliminates blue instead of just adding red with an overlay. However, it really needs some simple QOL improvements. I find myself opening the app every morning to manually turn off the filter, and then later reenabling the filter, since it doesn't automation turn off at wake up time. There really need to be shortcuts, quick toggles, tasker integration, app activities, or similar for enabling/disabling bluelight and red only filters.
47 people found this review helpful
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A Google user
October 11, 2018
I have a rooted Nexus 5X running Android 8.1 Oreo. For a short while, this app seemed to work fine. However, after a few hours, I noticed that the app randomly causes the screen to lock up. Touches would be registered, but the display would freeze, forcing me to restart my phone. This has happened twice in two days.
35 people found this review helpful
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Gabriel Avornicu
July 10, 2021
Absolutely sublime stuff. I also use it on my computer as I am a writer/journalist with quite a lot of screen time. // But... For it to be used as an application, it does need root access for Android (not an issue on Windows pc), and that kind of sucks. So have not felt the same happiness I felt when I ised it on my pc. // Mandatory location seems to be unnecessary. Put an automatic timer in it, and you solve your problem.
63 people found this review helpful
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What's new

Fixes a black screen bug.
Adds a time-picker for wake time.

Fixes tablet/phablet crashes.
Fixes Chrome flashing.