Biggest problem with F.lux used to be that it was tied to geo-location. As a Finnish person (with sometimes only a few hours of sunlight per day), you had to fa

Biggest problem with F.lux used to be that it was tied to geo-location. As a Finnish person (with sometimes only a few hours of sunlight per day), you had to fake your location to something that would approximate the desired circadian rhythm. I hope this has been addressed by now. (E.g. on macOS and iPhone you can simply just set the daily time when Night Shift activates.)