f.lux is a tool that changes the screen color to match the time of day. It's big weakness is that it only has two options for the duration to adjust the color of the display: 20 seconds or 60 minutes.

Are there any apps that perform a similar function as f.lux, but allow more flexibility in the duration to change the color of the display? Specifically, I would like something that can change the color more slowly than 60 minutes, just like the real sun.


So far, no answers have been posted, so I have removed the gratis (free of cost) requirement. I would still prefer gratis software, but I am opening this question up to recommendations of commercial software as well.

  • And ideally ideally you would want to link it to sun up/sun under times?
    – user416
    Mar 21, 2016 at 18:59
  • @JanDoggen Good question Jan. Ideally yes, but I'm fine to manually enter it. I do also like how f.lux tells the user the time to sunset/sunrise, but that's gravy and not essential. Mar 21, 2016 at 19:14


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Browse other questions tagged or ask your own question.