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Redshift is a Linux application similar to Windows' F.lux, which gives the screen a red tinge automatically at night. Supposedly, it reduces eye strain and helps prevent sleep problems.

Is there any way I can adjust my screen's color temperature to create the same effect on Android?

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I use F.lux for Windows and Mac, I love it. It's funny that you asked this, just last night I was wondering if F.lux existed for Android... – travis Feb 10 '11 at 4:25
Very similar question here:… – Al E. Feb 10 '11 at 14:35
As a sidenote, here's a question about the claims of F.lux and Redshift at Skeptics StackExchange: "Does the color temperature of a computer screen affect sleep patterns?" – Ilari Kajaste Oct 24 '11 at 18:25

11 Answers 11

up vote 6 down vote accepted

Would Color Filter Service fit your needs? You can tweak the RGB values of the filter however you want, so if you want a red filter just crank up the red slider and don't adjust the G/B values.

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Well I know for a fact that there is Cyanogenmod ROM which has "filter options" one of them being only turn on red, I know its not automatic, but there is widgets for the home screen. I'm pretty sure there is a way to do it by app but it would require root access.

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Tasker or Locale could probably turn it on, but I'm guessing a gradual change wouldn't be possible. – Matthew Read Feb 18 '11 at 17:56
unfotunatly when selected it completely turns off all other colors – Mehran Feb 18 '11 at 23:23
Sorry, but I could not find that setting (CYM11 here). Where's that? – Luis A. Florit Oct 2 '14 at 15:18
Settings-> Display & Lights-> (go to the bottom) Color calibration, at least that's what its like on my nexus 5 – Mehran Nov 5 '14 at 22:49

NeyetLight looks like it would do the trick.

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Twilight works well, although it's just a screen filter, it's automated and very similar to f.lux if you move the color temp to the right more

I love it although it does look terrible, it's all we have, and I am not going to root my phone just to have a true color temp change that's insane, plus it voids my warranty which I need to have and rooting is insanely difficult, DO NOT tell me it's easy i've read the instructions for it -- it's NOT EASY

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You can try the Screen Filter app.

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Gee whiz, man! Give us a link! – Al E. Feb 10 '11 at 4:01
unfortunately it's a no go but thanks for recommendation – david25 Feb 10 '11 at 4:06
Is it just the color? Maybe you could ask the dev to add color selection. – Matthew Read Feb 10 '11 at 4:28
yeah it's the color , regular LCD color makes your brain think its in sunlight and keeps you awake , more red color suppose to prevent that, i will try reaching the dev thx for the tip – david25 Feb 10 '11 at 4:48

Current builds of CyanogenMod have a feature called LiveDisplay. It's very similar to f.lux, automatic changes in the evening and all. It actually changes the color temperature of the screen; it's not an overlay.

It can be turned on from Settings > Display & lights > LiveDisplay > Display mode > automatic.

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Screen Adjuster by Netman that allows you to control the red tint on the phone.

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We have developed an app to adjust the screen temperature. It has no ads, over 200 good reviews, and small file size.

Bluelight Filter is a tiny utility (just 86kb!) to reduce the harmful effect of blue light emitted by smartphones & tablets. Blue light interferes with the sleep hormone production of our body and affects sleep.

Bluelight Filter

Affiliation: Developer, Non-profit

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It doesn't provide red tint, but for late night, ultra-dim reading I use adjBrightness. It does require a rooted device.

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Twilight (free)

Twilight automatically makes the screen redder at night, with options for color temperature, intensity, and brightness. It has a nice Material design too.

Lux Lite (free) or Lux Auto Brightness ($3.80)

From Lux Dash > Triple star icon, you can enable/disable Night Mode and change Night Mode's color temperature. Automatic color temperature changing at sunset requires the paid version.

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f.lux is now available for Android, but with some caveats:

  • The developers still consider the app to be in "preview" as of writing
  • It is stated to currently work on "most" devices running Android 5.0+ and "some" devices running 4.4
  • Root is required
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