on android 6.01 and up it is built in as "bluelight filter" 

On Tue, Jun 6, 2017 at 12:41 PM Ben Matthews <[log in to unmask]> wrote:

And for android devices, Twilight.

http://twilight.urbandroid.org/

On Tue, Jun 6, 2017 at 10:35 AM, Caleb Clark <[log in to unmask]> wrote:

I've been using the free "f.lux" on my Mac at night. Takes the blue light out that messes with sleep because it's daylight temp. Has a circadian rhythm friendly movie mode, and darkroom mode. Lots of geeky data and no BS interface or up selling. 

PC World review here: http://www.pcworld.com/article/2056895/review-f-lux-makes-your-computer-usable-at-night.html

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Caleb Clark
Marlboro College, Degree Chair, Teaching with Technology
W: marlboro.edu/mat | E: [log in to unmask] | P: 802-258-9207

"The technology itself is not transformative. It’s the school, the pedagogy, that is transformative." - Tanya Byron

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Ben Matthews

Technology Integration Specialist

Barre City Elementary & Middle School

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Mike Norkun

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"Nature does not hurry, yet everything is accomplished."