Twilight
App that adapts your device screen to the time of day to reduce blue light exposure before
Twilight is an Android app for phones and tablets that adjusts the screen to the time of day. After sunset, it filters the blue spectrum with a red filter, with intensity tied to local sunset and sunrise times. It can also lower screen backlight below the standard controls, which the site notes is useful for reading in bed.
The app is aimed at people who use a phone or tablet in the late evening, including those who have trouble falling asleep or children who use a tablet before bedtime. The site describes it as a solution for these situations and notes that it can be more pleasant on the eyes for night reading. It also discusses AMOLED screens, stating that Twilight has been tested on such a screen for 2.5 years without signs of depletion or over-burning, and that proper configuration may reduce light emission and increase screen life. The site provides links to research on circadian rhythm, melatonin, and melanopsin.
12 alternatives to Twilight
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