It seems as pretty much every platform has it already built-in. Apple was first (?) to stole the idea from f.lux, and since then everyone else followed suit.

It seems as pretty much every platform has it already built-in. Apple was first (?) to stole the idea from f.lux, and since then everyone else followed suit. I don't see a lot of people going out of their way to install f.lux. On macOS I use the native option because it allows you to disable it for projectors and similar.