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The description Twilight Apk

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!

WARNING: Android O does no allow the app to cover your notifications any more..

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.

Twilight 11 APK Download BoxBack top

  • 11
  • Android 4.0.x - Ice Cream Sandwich (SDK: 14)
  • December 3, 2019
  • 00A0E53C9A3F5D14DA5E698FF420E4A7776EA4B1
  • 780b92a90a63521a7bd6bd629eaee762
  • - Filtering notification shades, status bar and lock screen when enabling Twilight accessibility service
    - Android TV works again with accessibility service
    -Works on Wear watches without the Draw over other apps permission screen though Accessibility service
  • View Permissions
  • 10.4
  • Android 4.0.x - Ice Cream Sandwich (SDK: 14)
  • November 6, 2019
  • 00A0E53C9A3F5D14DA5E698FF420E4A7776EA4B1
  • 27c59f53048725e927516697b5838607
  • View Permissions
  • 10.3
  • Android 4.0.x - Ice Cream Sandwich (SDK: 14)
  • October 4, 2019
  • 00A0E53C9A3F5D14DA5E698FF420E4A7776EA4B1
  • 378c64a0d7116f135952a692a599e1c0
  • View Permissions
  • 10.2
  • Android 4.0.x - Ice Cream Sandwich (SDK: 14)
  • August 23, 2019
  • 00A0E53C9A3F5D14DA5E698FF420E4A7776EA4B1
  • 1a884ff32cb03e29f1936a9d66de2015
  • View Permissions
  • 10.1
  • Android 4.0.x - Ice Cream Sandwich (SDK: 14)
  • August 9, 2019
  • 00A0E53C9A3F5D14DA5E698FF420E4A7776EA4B1
  • fe7d4dbbb1c3ebecb03b2e33ff9047cc
  • View Permissions
  • 9.9
  • Android 4.0.x - Ice Cream Sandwich (SDK: 14)
  • June 24, 2019
  • 00A0E53C9A3F5D14DA5E698FF420E4A7776EA4B1
  • 74eca71caf5b73b99229968b2f8314a8
  • View Permissions
  • 9.9
  • Android 4.0.x - Ice Cream Sandwich (SDK: 14)
  • May 27, 2019
  • 00A0E53C9A3F5D14DA5E698FF420E4A7776EA4B1
  • c58e2214fdce7ec6fb5cb7ee6acb9fcb
  • View Permissions
  • 9.8
  • Android 4.0.x - Ice Cream Sandwich (SDK: 14)
  • May 7, 2019
  • 00A0E53C9A3F5D14DA5E698FF420E4A7776EA4B1
  • 20b18336751df81edcc6c8f5120b708b
  • View Permissions
  • 9.6
  • Android 4.0.x - Ice Cream Sandwich (SDK: 14)
  • April 26, 2019
  • 00A0E53C9A3F5D14DA5E698FF420E4A7776EA4B1
  • 242f7ab9aff10d6c13d9b690b4f93a6f
  • View Permissions
  • 9.4
  • Android 4.0.x - Ice Cream Sandwich (SDK: 14)
  • December 4, 2018
  • 00A0E53C9A3F5D14DA5E698FF420E4A7776EA4B1
  • c24452a1ec9f42a46364d7df6cd56e5b
  • View Permissions

10 recent comments of Twilight APK

Subhajit Chakraborty

I am using it for a month so it's time for rating. App works great. Filter seriously relief eye stress from night time usage. Actually i am typing the review by activating this app right now. Also automatic activation of this app depending on sun ☀ rise is pretty cool and work flawless. Would love to see more colour choice because red always gets monotonous. Overall definitely 5 star ? app.

Chris Ziffer

I was originally looking for an astrophotography red light function for my Droid Turbo 2 to help preserve my night vision. I thought I wanted something that I could turn off and on manually with a few taps. Decided to give this a try, and couldn't be happier. I still have the ability to control the main brightness through the settings on my phone , but now it is amplified based on my settings that I choose within your app during night the hours between sunset and sunrise. Excellent functionality. ??

Joe Doyle

Having a tough time with the permissions, seems as if once this app is enabled everything to do with screen overlay turns off. All my whatsapp contacts were un-synced, and SMS is also having permission issues. Does this happen to everyone else? I obviously need to be able to fully utilize my phone before bed. Other than that, nice UI and easy to use/navigate. HELP!!

I recently started healthy sleeping habits and not only does Twilight make my phone's screen very gently before sleep, it also serves to remind me bed time is coming. I feel sleepy now when it turns on and have been sleeping well. I even got red lens glasses to wear in the evenings... Makes a huge difference!

Linda N

Not dimming or taking out blue. Tried to set custom but tapping that button just halts program as that button seems to be on top of the custom button. Update: finally got it to dim by setting up a "bedtime" mode and manually turning it on & off but...the if you try to use it it will blink With your normal screen setting pretty often. That's an eye opener! Not for me, unless fixed.

Jonas Golland

Thanks, very good for my mind, flexible options even though complex but that's in depth at least, very smooth transitioning, helpful and inspiring attention to colour. Update 21.9.16... very good, it's sorting out its bugs of switching off while using other apps. I like having it on always. Sometimes it would stall my LG keyboard app for long time so I uninstalled it. Months later reinstalled, had same problem for weeks until a week ago, seems ok. Colours are good, a bit more yellow might be better.


Only thing is that I have app installed (like pie, quick gesture buttons) the filter does not apply to it. what can I do about that? also I have a screen lock that it won't show the filter with and if I don't turn off these apps at night then I will be blinded ? could you fix these things? Using omni swipe and gesture lock screen...

Nazim Ali

relax my eyes after used it

Michael Monti

You know I really like it. I don't really use the red filter because it kind of throws me off personally, but it can really drastically lower the brightness level (screen dim) twice as much as the phone's settings, with the range of 0% to 80% to choose from. I'm sure this will greatly help my battery time. Great job with this app guys. It took me less than 10 minutes to learn all the settings and operations and so far I haven't seen a single ad. So I'm going to say there aren't any although I could be wrong.

Andria VanBuskirk

Definitely helps my eyes! Too early to know if it will help w/ headaches & sleep. I have it set to "always on" but I am constantly having to put it back on! Seems like this issue keeps the app from helping in the long run.

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