The best free alternative to f.lux is Redshift, which is also Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to f.lux and many of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to f.lux are LightBulb, RedshiftGUI, Twilight and Red Moon.
Redshift adjusts the color temperature according to the position of the sun. A different color temperature is set during night and daytime.
It doesnt't work sometimes...
It's just not as good as f.lux is.
Background application that adjusts screen gamma, making the colors appear warmer at night, reducing strain on your eyes.
user-friendly interface and easily configurable
Has a customizable schedule instead of 50 meme filters no-one will ever use.
Open source, far more options, faster
RedshiftGUI changes the color temperature of your monitor to better match that of your surrounding. This means that it sets a cooler color temperature during the daytime (due to natural lighting) and sets a warmer temperature at night (due to indoor lighting). Similar to f.
it is much easier to install and just works right away!
The app filters the blue spectrum on your phone or tablet after sunset and protects your eyes with a red filter. The filter intensity is smoothly adjusted to the sun cycle based on your local sunset and sunrise times.
The app is free on F-Droid and on GitHub but you can buy it on the Google Play Store to support the developer.
Straightforward. Fast. No ads. No trackers.
Enjoy free cross-platform blue light reduction and PWM flicker-free brightness control with Iris mini. Minimalistic design, portable, and automatic for no-hassle, eyestrain-relief across all devices. Simply double-click to activate, perfect for every lighting condition.
Very minimalistic and lightweight. Doesn't affect games (i.e. microstuttering) the way f.lux does (if you set it to Paused mode).
Redshift Tray is a no-frills GUI for the screen temperature adjustment tool Redshift.
Midnight Lizard web-extension for Google Chrome™ and Mozilla Firefox™ provides custom color schemes for all websites.
Reduces blue light and flicker for eye comfort, supports auto color temperature adjustment based on time, customizable modes, overlays, color and font options, docking station support, and accessible part-screen filtering for diverse needs.
Iris has all the functionality of f.lux and much more
Intuitive to use and easy to install
Adjust the color temperature of your screen according to your surroundings. This may help your eyes hurt less if you are working in front of the screen at night.
It makes the color of your computer's display adapt to the time of day, warm at night and like sunlight during the day.
Dimmer controls monitor's brightness not color temperature.
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This is open source, while f.lux wants you to download a binary and run it constantly on your system.