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 six of them are so hopefully you can find a suitable replacement. Other interesting alternatives to f.lux are Twilight, Red Moon, Night Shift: Blue Light Filter and Night Screen.
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.
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.
Do you use your mobile phone after sunset? Do you use your phone within three hours of your bed time? If yes, then your device might be taking your sleep away. Bluelight from your mobile screens sends a signal to brain to wake up, and makes it difficult for us to sleep at night.
Night Screen is created for those people who spend a lot of time at night working.
Limit your exposure to energy-efficient lighting before bed. In addition to the LED screens in your electronics, energy-efficient lighting emits a lot of blue light.
Denmark
EU
Spain
This is open source, while f.lux wants you to download a binary and run it constantly on your system.