The best alternative to f.lux is Redshift, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to f.lux and nine of them are so hopefully you can find a suitable replacement. Other interesting alternatives to f.lux are Iris mini, Iris, CF.lumen and Dimmer.
Redshift adjusts the color temperature according to the position of the sun. A different color temperature is set during night and daytime.
No longer working on modern systems, and no longer updated.
It doesnt't work sometimes...
It's just not as good as f.lux is.
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).
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
CF.lumen - don't let your phone blind you! CF.lumen changes the colors of your Android device's display based on the position of the sun. With the default settings, your display will get a warmer tint (lower color temperature) when the sun is down, to look more like indoo.
Dimmer controls monitor's brightness not color temperature.
NightTone makes your screen more comfortable, enjoyable and healthier by shifting the colors of your display to a warmer, eye-friendly palette. It makes you sleep and feel better.
Screen Shader is a chrome extension designed to tint the screen a “cozy” orange color to reduce eye strain, eye fatigue, and restore day/night balance, while also providing a wide variety of settings for everyone's different tastes!.
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This is open source, while f.lux wants you to download a binary and run it constantly on your system.