Blue light keeps you awake. It’s science. While it’s useful during the day to keep us booseted and focused, light on the blue end of the spectrum of visible light is “uniquely detrimental” to our sleep, according to Psychology Today. With many of us glued to our screens well past sunset, the transition from Concentration Mode to Sleep Mode is pretty jarring for our brains, which didn’t evolve with post-dusk light in the mix. This effect explains the massive popularity of f.lux, a computer app that gradually tilts your screen’s color away from blues and into reddish tones over the course of the evening. Now that sleep-aiding magic is coming to Android.

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A similar app is currently available in the Google Play Store: Twilight. However, there’s some dispute over how effective Twilight actually is, since all it does is apply a red filter over everything. Rather than use a filter, f.lux actually accesses pixels from the GPU and desaturates all the blue, resulting in a true absence of blue light. If you’re someone who finds themselves on their smartphone all the way up until your head hits the pillow, this could be something to look into.

Right now, f.lux for Android is still in its beta stage. If you want in on the action, head on over to the f.lux forums, sign up, and ask to be added to the testing program. In the meantime, tell us your thoughts on this app. Do you use it for your computer? How well would you say it works? Let us know your take in the comments below!


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  • Zoide

    You should mention CF.lumen, since it’s way better than Twilight (doesn’t just apply a red filter over everything).

    • crosph?

      Yeah… lots of people keep saying “booo just get twilight” but it’s kinda rubbish, even for a filter – it tints lack areas red, for goodness’ sake.

  • Some Guy

    I have F.lux on my mac and it is pretty dope. Allows you to create profiles based on day, sunset, and night modes.

    • BeCareful

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      • Some Guy

        come get me m8

  • Vinicius Lima Silva

    the cm (and cm custom based rom’s) feature that implements it, is what?

    • Richard Riker

      it’s LiveDisplay. I would say it’s exactly the same. I had used it in SlimLP, but since then never found anything like that (Twilight looks very ugly). Maybe that’s the reason why

  • Mauricio Osorio

    This feature is already in CyanogenMod.

  • Chris DaCosta

    Also already in touch wiz. I have it on my note 10.1 2014 tablet. And I can choose which apps are changed to the non-blue hue.

    • saksham

      yep ! in my s6 edge too , under screen mode if u choose the basic dispaly option then blue light is gone

  • crosph?

    Folks saying it’s already in Touchwiz or CM have a perfectly good point – it’s good to point it out, just in case people with TWiz and CM don’t know they have the feature – but not everyone has (or wants) a Samsung phone, and in the case of folks with root access, not everyone wants to (or can) flash CM. For those people, something like this is great, even if alternatives like CF.lumen and (ugh) Twilight exist.

  • Goblin Shark

    Further research into the effects of blue light at night are finding it doesn’t negatively affect health or sleep, but the use of electronics of ANY screen hue does so if you can’t access this app I wouldn’t worry about it. Put away your electronics a few hours before sleep and you’ll be fine.

  • I use LiveDisplay that comes with CM. Not sure if that uses the filter though. I’ll give f.lux a try as I already use it on my PC and Mac.

  • Most Internet Warriors will not use that. BUt I’m going to install, hope that will not going to drain the battery

  • shreyans

    I use the blue filter at night … in my zenfone 2

  • Gangsta101

    Question: What’s the built in blue light filter for Samsung Touchwiz called or how can it be accessed.

    Thanks in advance

    • saksham

      if u have any 2015 galaxies , go to display settings and under screen mode choose basic

      • Gangsta101

        Thanks mate. I felt that was it after poking around, but I had to be certain.

  • sri charan

    Zenfone 2….This feature is built into the OS at a kernel level…..

  • Zaid Shakil

    Been using on PC for past 4 years now :)

  • Bob

    Whether or not we want to argue if it works, the filter is so much easier on your eyes. Go from the f.lux filter, back to normal blue light and I can guarantee you your eyes will start to hurt from the harshness of “blue light”.