The most popular alternative 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 so hopefully you can find a suitable replacement. Other interesting f.lux alternatives are LightBulb (Free, Open Source), SunsetScreen (Paid), RedshiftGUI (Free, Open Source) and Twilight (Free).
- Redshift adjusts the color temperature according to the position of the sun. A different color temperature is set during night and daytime.
- Background application that adjusts screen gamma, making the colors appear warmer at night, reducing strain on your eyes.
- 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.
- RedshiftGUI changes the color temperature of your monitor to better match that of your surrounding.
- 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.
- Iris mini is free cross-platform blue light reduction and PWM flicker free brightness software.
- Iris is software which makes monitors healthy for the eyes. With iris you can reduce the blue light emitted from your screen for better sleep, reduce the brightness of your screen without PWM and avoid eye pain.
- Adaptive screen brightness and temperature for Windows and Linux.
- Screens emit blue light, which can keep you up at night. Night light displays warmer colors to help you sleep.