What are some alternatives?
When comparing RedshiftGUI and Friendeye, you can also consider the following products
f.lux - f. lux is a piece of software for Windows, Mac, Linux, iOS, and Android that provides a blue light filter over your screen. Research suggests limiting our exposure to blue light in the hours before bedtime can help us fall asleep faster.
CareUEyes - CareUEyes is an eye protection software for windows that comes with blue light filter, screen dimmer, and break reminder
LightBulb - Background application that adjusts screen gamma, making the colors appear warmer at night...
Desktop Dimmer - Enable darker-than-dark dimming for internal and external screens.
SunsetScreen - Whether you're a morning lark or night owl, SunsetScreen allows you to set the time of the...
PangoBright - Screen dimming software that allows you to control the brightness of your laptop screens as well as external monitors.