I use it on my Linux boxes and it works great. There is a command line client, and a separate optional gui for control. Android folks should check out Twiligh

I use it on my Linux boxes and it works great. There is a command line client, and a separate optional gui for control. Android folks should check out Twilight https://play.google.com/store/apps/details?id=com.urbandroid.lux https://play.google.com/store/apps/details?id=com.urbandroid... - note that it works by putting a colour filtered overlay on top of the existing display content. Google does block some actions while this happens - eg accepting terms/permissions for installation of an app. Consequently you have to disable twilight when doing things like app installation/updates. (flux and redshift tweak the gamma tables directly - something that isn't available on Android.)