When comparing Keka vs F.lux, the Slant community recommends F.lux for most people. In the question“What are the best Mac OSX apps for someone that's new to Apple?” F.lux is ranked 5th while Keka is ranked 13th. The most important reason people chose F.lux is:
Helps provide better sleep for more energy during the day.
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Pros
Pro Free and fast
Pro RAR5 support
RAR 5.0 format introduced in 2013 uses a new compression algorithm that is not compatible with previous versions of the format. As such, all software needs to be updated to include support for RAR 5.0 and Keka is one of the first archive tools to have added support it.
Pro Option to extract only certain files
Pro Can help sleep better
Helps provide better sleep for more energy during the day.
Pro Eases eye strain
Decreases color temperature at night, changing the normally fluorescent blue of an LCD monitor to a soft orange. Much easier on the eyes, especially in a low-light environment.
Pro Subtle transition
The transition from daytime to nighttime color modes takes an hour by default and will detect your current timezone, meaning that it will happen in the background at sunset, often without you noticing.
Cons
Con Takes a while to get used to
After installing F.lux, the screen will look a lot more yellow. This takes about a week to fully get used to. You can ease into it by setting the color temps higher than the recommended defaults.