SunsetScreen is described as 'Whether you're a morning lark or night owl, SunsetScreen allows you to set the time of the sunset and sunrise, so you can have full control over your sleep cycle' and is a color temperature tool in the system & hardware category. There are more than 50 alternatives to SunsetScreen for a variety of platforms, including Windows, Mac, Linux, Android and Wayland apps. The best SunsetScreen alternative is f.lux, which is free. Other great apps like SunsetScreen are Redshift, LightBulb, Red Moon and RedshiftGUI.
What sets sunset screen apart is that the day/night times are entirely user controlled, NOT location-based which is not good for everyone. All alternatives including flux which do not offer a user-controlled day/night time setting should not be considered good alternatives!