F.lux for Windows

  • Free
  • In English
  • V 4.119
  • 4.2
  • (659)
  • Security Status

Softonic review

Automate your screen brightness for night or day

If you spend long days in front of the computer, it's important that the monitor is comfortable to look at. f.lux is designed to help with this by automating screen brightness as the sun goes up and down.

f.lux consists of a really smooth graphical display that shows the current position of the sun. In Settings you can choose a brightness that suits you for the day and the night, and enter your latitude. I didn't know my latitude either, but if you search for your nearest major town or city in Wikipedia you'll find it! If you click the sun on the interface it gives you a quick preview of the dimming effects that will happen over the 24 hour period.

f.lux does its job without problems. It features an override button, so if you're doing color sensitive work you won't be disturbed by a changing screen. It could be improved by automatically finding your latitude, or at least being able to calculate latitude based on your named location, but that's a small issue. How useful this is depends on your computer usage - in an office where the light doesn't change it's a bit of an irrelevance!

While it's not difficult to change screen brightness, f.lux means you never have to think about it again.


  • Simple and attractive
  • Minimizes to system tray


  • Need to find your own latitude!

Older versions

F.lux for PC

  • Free
  • In English
  • V 4.119
  • 4.2
  • (659)
  • Security Status

User reviews about F.lux

  • James Karam

    by James Karam

    it's a good software to protect your eyes at night, i use iris mini but limited features in free version, f.lux is free and very good features.

  • sufyan umar

    by sufyan umar

    its a Good app i really enjoy it keep it F.Lux
    i have try many app but i see that f.lux is the Best

  • Vishal Dahiya

    by Vishal Dahiya

    good work helpful in long work on pc protect eye , protect from

  • Vishal Dahiya

    by Vishal Dahiya

    good UI,peoper work in pc.helpful pc app.protect eye during long work.

  • Anonymous

    by Anonymous

    I would recommend F.lux to anyone..
    I've used F.lux for a while now, and I am amazed that this useful piece of software is actually free.

  • Anonymous

    by Anonymous

    Very nice App.
    I like this so far, I have had it for 2 days and the light at night is very nice on the eyes like stated. I would recommend it to More


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Laws concerning the use of this software vary from country to country. We do not encourage or condone the use of this program if it is in violation of these laws.