Twilight's review

    Published: 2015-06-11, by .

    Twilight alters your screen's backlighting according to the sun cycle

    • Softer light
    • Great for bedtime
    • Battery guzzler
    • Occasional crashes

    "Reduce Screen Brightness For A Proper Night's Sleep"


    Several studies have highlighted the potentially harmful effects of the blue light that emanates from our devices' screens. Twilight softens the impact on your eyes, and claims to give you an extra 1 hour of sleep every night--yes please!


    You're less likely to get a headache or struggle to drift off with Twilight: it's a great companion to f.lux on a computer. It's perfect for winding down (especially for kids who love their iPads) and means you can enjoy all your favorite apps with no repercussions!


    Uses up lots of battery life, so it's best to have your phone plugged in while in bed if possible. It is prone to occasional crashes too.

    Tags: aplicacion twilight , se bloquea el boton instalar , barry tillman


    by Oliver

    Jun 11, 2015


    Are you having trouble falling asleep? Are your kids hyperactive when playing with the tablet before bed time?
    Are you using your smart phone or tablet in the late evening? Twilight may be a solution for you!

    Recent research suggests that exposure to blue light before sleep may distort your natural (circadian) rhythm and cause inability to fall asleep.

    The cause is the photoreceptor in your eyes, called Melanopsin. This receptor is sensitive to a narrow band of blue light in the 460-480nm range which may suppress Melatonin production - a hormone responsible for your healthy sleep-wake cycles.

    In experimental scientific studies it has been shown an average person reading on a tablet or smart phone for a couple of hours before bed time may find their sleep delayed by about an hour.

    The Twilight app makes your device screen adapt to the time of the day. It filters the flux of blue light emitted by your phone or tablet after sunset and protects your eyes with a soft and pleasant red filter. The filter intensity is smoothly adjusted to the sun cycle based on your local sunset and sunrise times.

    Get more from Twilight
    1) Bed reading: Twilight is more pleasant on the eyes for night reading. Especially as it is able to lower the screen backlight far below the ability of the backligt controls on your screen

    2) AMOLED screens: We have tested Twilight on an AMOLED screen for 2.5 years without any sign of depletion or over-burning. If properly configured Twilight causes less light emission (by enabling dimming) with more equal light distribution (dark areas of the screen such as the status bar get tinted). This may in fact increase your AMOLED screen life time.

    Basics on circadian rhythm and the role of melatonin

    - location - to find out your current sunset/surise times
    - running apps - to stop Twilight in selected apps
    - write settings - to set back-light
    - network - access smartlight (Philips HUE) to shield you household light from blue

    Automation (Tasker or other)

    Related scientific research

    Amplitude Reduction and Phase Shifts of Melatonin, Cortisol and Other Circadian Rhythms after a Gradual Advance of Sleep and Light Exposure in Humans Derk-Jan Dijk, & Co 2012

    Exposure to Room Light before Bedtime Suppresses Melatonin Onset and Shortens Melatonin Duration in Humans Joshua J. Gooley, Kyle Chamberlain, Kurt A. Smith & Co, 2011

    Effect of Light on Human Circadian Physiology Jeanne F. Duffy, Charles A. Czeisler 2009

    Efficacy of a single sequence of intermittent bright light pulses for delaying circadian phase in humans Claude Gronfier, Kenneth P. Wright, & Co 2009

    Intrinsic period and light intensity determine the phase relationship between melatonin and sleep in humans Kenneth P. Wright, Claude Gronfier & Co 2009

    The Impact of Sleep Timing and Bright Light Exposure on Attentional Impairment during Night Work Nayantara Santhi, Daniel Aeschbach & Co 2008

    Short-Wavelength Light Sensitivity of Circadian, Pupillary, and Visual Awareness in Humans Lacking an Outer Retina Farhan H. Zaidi & Co, 2007

    High sensitivity of the human circadian melatonin rhythm to resetting by short wavelength light. Lockley SW, Brainard GC, Czeisler CA. 2003

    Sensitivity of the human circadian pacemaker to nocturnal light: melatonin phase resetting and suppression Jamie M Zeitzer, Derk-Jan Dijk & Co 2000

    For a desktop alternative, try RedShift (Linux) or on Windows the app which has no relation to this project whatsoever, whose name cannot be said aloud or whispered as it is a Trademark, lets call it Lord Voldemort of the blue light flux filtering apps.Guessed it? Let us know in the comments.

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    Users review

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    Users comments for Twilight

    Chad T

    by Chad T

    Jan 12, 2018  |  "Poor"

    This app started out good but then they tried to sneak in an update that gives them access to the contents of your SD card. All this app does is make your screen red...What legitimate reason could they have? None! Shady #&$@ers.

    victoria g

    by victoria g

    Jan 12, 2018  |  "Awesome"

    Actually helps

    James F

    by James F

    Jan 12, 2018  |  "Awesome"

    Simple and effective, what more do you need?

    Joshua Howard

    by Joshua Howard

    Jan 12, 2018  |  "Awesome"

    Works exactly as advertised. Dims your screen and adds a red filter to reduce eye stress at night. Set a time and it'll automatically do it. Only uninstalled because my Pixel has this feature built in.

    A Google user

    by A Google user

    Jan 12, 2018  |  "Awesome"

    Nice eye protector app

    Kat And Nick

    by Kat And Nick

    Jan 12, 2018  |  "Awesome"

    I love this app!!! It helps me sleep and I love how you can make the color go lighter and darker!!! I definitely recommend using it!!!??