My new zenfone has a bluelight filter built in. Its part of the zenUI so just a click on the regular pull down thingy. Its really nice. I always use it when I read on my phone.
I put that twilight app on my fire6, but I can't quite get it right as there is fiddling involved. I don't like when I have to fiddle with stuff. On my phone its just on or off, it works. On that app I have to figure out where I want the slider and the colors. Plus, to use it I have to get out of my book, find the app, turn it on, go back to the book. Don't know if it uses more battery as I haven't used it long enough on it.
I really hope my fire6 gets that new update and it includes that filter built in.
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