f.lux - Adjust your screen to daylight

Tired? Headache? It is more common in people who sit in front of a computer screen all day. The freeware f.lux adjusts the screen color according to the daylight, so that your eyes get tired less quickly.





Windows XP/Vista/7/8

Mac OS X 10.5 or later


iOS (jailbreak necessary)



8 Score 80
  • Pros
  • User friendly
  • For all platforms
  • Less tiring for your eyes
  • Negatives
  • Is getting used to

f.lux is a tool for anyone who spends too many hours staring at a computer screen every day. During the day the white-blue light is not much of a problem, but in the evening it could have a negative effect, causing fatigue, headaches or sleeping problems.

The solution? f.lux. The program works in the background and automatically adjusts the color temperature of your screen as the night falls. f.lux is also available for Windows, Mac OS X and Linux.

Warm glow

After installation you will see a small program window. As soon as you go through Settings If you enter your city of residence, f.lux knows exactly when the sun sets and rises in your area. By default, f.lux uses recommended brightness levels (for example, 6500K during the day), but you can adjust these manually if you want.

In the evening, your screen takes on a yellow glow that is less tiring for your eyes.

You can also adjust the transition speed to your liking. You can choose from a fast mode of about 20 seconds and a slow transition that lasts an hour and is therefore hardly noticeable. In addition, there is also a special Movie Mode which does not affect the colors for two and a half hours. Do you want to pause f.lux or even turn it off? That too is very simple and can be done with one mouse click.

The settings are identical but the interface is slightly different between the Mac OS X and Windows versions.


A yellow glow on your screen? In the beginning it takes some getting used to. Especially if you increase the transition speed fast have set. However, we are convinced that such a warmer color temperature is less tiring for your eyes. Our advice? Be sure to give the tool a try! f.lux is after all completely free and very easy to use.

If you cannot get used to the yellow screen after a few days or weeks, simply remove the program again. Incidentally, the program is not recommended if the color fastness of your screen is important.

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