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 LightBulb, SunsetScreen, Redshift Tray and Dimmer.
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
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.
Redshift Tray is a no-frills GUI for the screen temperature adjustment tool Redshift.
Dimmer controls monitor's brightness not color temperature.
Setting the color temp of the screen really only requires about 40 lines of C (80 or so all inclusive). sct is a crude utility which does roughly that. I’d say exactly that, but some of the calculations aren’t actually exact.
Form 1 Hour Software by skrommel, it can dim the screen by applying a transparent gray layer on top of your opened applications
this app puts a Monitor Brightness icon to on Taskbar Tray. So you can access it with 1 click.
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This is open source, while f.lux wants you to download a binary and run it constantly on your system.