redshiftgui

yup worked well almost 50 to 60 percent brightness lowered so its working well. Good job developer team.

Nice, works with multiple monitors on multiple GPU's too. I use it for a monitor connected to my dedicated GPU and another one connected via the GPU embedded in the CPU.

Works well but is pretty limited. Brightness stops decreasing at ~50%, so doesn't get very dim, though should be good enough for most. Can have it adjust color on a schedule, but not brightness, and schedule can't be adjusted. And the lower the brightness, the less the color changes. I suspect all of these issues are related to the fact that Redshift, per its FAQ, does a "fake" brightness adjustment by tweaking the gamma instead of adjusting the monitor backlight, so this program can't really be blamed for that, but it does ultimately have the same effect of severely limiting this program's usefulness. The one thing that makes this better than f.lux is that, despite the brightness adjustment being fake, it's apparently less fake than f.lux's, which seems to use an overlay. Dimming a screen with an overlay is very annoying since it can have some negative effects, most noticeably that screenshots are similarly dimmed, meaning you have to disable it before taking one. Not sure why these programs don't just use the DDC protocol to perform the dimming.

Quite an improvement over the original, since you can also control the redshift setting yourself. Helps you sleep better if you use before going to bed.

Good, does mostly what it say.