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Ever notice how people texting at night have that eerie blue glow?

Or wake up ready to write down the Next Great Idea, and get blinded by your computer screen?

During the day, computer screens look good—they're designed to look like the sun. But, at 9PM, 10PM, or 3AM, you probably shouldn't be looking at the sun.


f.lux fixes this: it makes the color of your computer's display adapt to the time of day, warm at night and like sunlight during the day.

It's even possible that you're staying up too late because of your computer. You could use f.lux because it makes you sleep better, or you could just use it just because it makes your computer look better.

Download f.lux

Free for macOS
Download f.lux
Free for Linux

By downloading, you agree to the f.lux EULA

(also available for Windows Mac Linux iPhone/iPad Android)

f.lux makes your computer screen look like the room you're in, all the time. When the sun sets, it makes your computer look like your indoor lights. In the morning, it makes things look like sunlight again.

Tell f.lux what kind of lighting you have, and where you live. Then forget about it. f.lux will do the rest, automatically.

f.lux for Windows

Want to support f.lux?

Here's our Paypal link

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Read our Privacy Policy and EULA. Using f.lux at work? Refer your IT admininstrator to our FAQ.

f.lux is patent pending. Do you make a cell phone, display, lighting system, other cool sleep tech, and want to talk about collaboration? Contact us: support@justgetflux.com