Very nice. Default color settings required some tweaking for me (800k is rather red  also ideally I'd like to set a curve or multiple scheduled changes in brightness /color  but that's just an idea)  but I absolutely love how simple and straightforward the app is  and how it only requests permissions if you use them. Would definitely recommend  if not paid then the free version on fdroid  I just bought the app because I wanted to show support :) thanks for making this!
April 17 2017