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 seven of them are so hopefully you can find a suitable replacement. Other interesting alternatives to f.lux are SunsetScreen, Twilight, Windows Night Light and Lumen.
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.
Whether you're a morning lark or night owl, SunsetScreen allows you to set the time of the sunset and sunrise, so you can have full control over your sleep cycle.
Can set also brightness level to change automatically. Can set the time to change to night time yourself.
Much better transitions and less laggy
I can change the settings in this software to activate in 24 hours but I can't active red layer in Flux in 24 hours.
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.
To schedule Night Light so it turns on automatically, select Start > Settings > System > Display > Night light > Night light settings.
Lumen - magic auto brightness based on screen contents. You control Lumen simply by using your brightness keys - it'll automatically learn your preferences.
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This is open source, while f.lux wants you to download a binary and run it constantly on your system.