Twilight v7.8 build 246 [Pro]


Overview: Are you having troubles to fall asleep? Are your kids hyperactive when playing with the tablet before bed time?

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.

What's New:


  • ability to filter lock screen / home screen wallpaper separately, support for different wallpaper on lock screen and home screen
  • only lock screen wallpaper filtering is now default on oreo
  • link to help translate the app for every one (menu - translate the app) 7.6
  • fix for Oreo's annoying "X apps running in background" notification, look for "Hide notification" on the main screen.. 7.5
  • Android O adaptive icon support
  • fixes in wallpaper filtering
  • Twilight
  • Twilight
  • Twilight
  • Twilight
  • Twilight
  • Twilight
Developer Urbandroid Team Last Updated October 3, 2017
Number of Downloads 5,000,000 - 10,000,000 Current Version Varies with device
Content Rating Everyone OS Version Varies with device
File Size Varies with device Score 4.6
More Info:
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Nadia Janssens

My eyes thank you!

So, I'm really bad at the whole sleeping thing but this app made it a bit easier. Now when I read before bed I actually get sleepy! Bit of a hassle having to pause it when giving other apps permissions, but it's still very much worth it.

Pranav Gohil

Add a shortcut to home screen

App is so good but add an option for the home screen to maintain light intensity and on and off.

mikhail lacaba


Enables manual download for android even when app is off. I need to un-install it every time I want to download something new.

Shalicia Johnson


So easy on the eyes, especially when checking my phone in the middle of the night.

Andrew Wong

It actually works

Henry Davies

I can sleep again

Sometimes no screens for an hour before bed is impossible. Thank you for not making them such an issue!

Hunter Skinner

Pretty cool

Seems a little weird at first, but you'll never go back after using it at night

Darryl Woodbury


I was skeptical of this app so I tried it out for a week. After a week, I have been falling asleep faster and it makes the screen so much easier to look at when it's dark. I love this app.

Veronica M


This app is great!! It's easy to adjust and surprisingly effective. I fall asleep looking at my phone now instead of being jacked all night because I refuse to put it down. Give it a try!

Mandy Harker

Love the update

I love this app, I use it every day on both my phone and my tablet. The recent update is great, I really like the pop up box that allows me to adjust the colour intensity and pause/start the filter without needing to go into the full app. The softer colour also helps reduce my headaches and if I do have a headache the red light allows me to look at my phone if I have to. I would love to see this made PC friendly too, I'd install it on my Windows laptop in a heart beat.

Regina Hatley

If only it dimmed the soft keys

Wonderful app, been using it for a few years. It worked flawlessly on previous phones. The only issue I have with it now is that it does not dim the soft keys on my Nexus 6p. I think the phone itself has to be rooted to dim the soft keys. If the developers could find a way around this I would be extremely happy. It's frustrating having the majority of the screen dimmed at night except for the bright soft keys!



Sometimes, when I'm just reading an ebook or watching a video on Youtube, the filter suddenly goes off. I've already set the filter to be always on so I don't understand why it does that.

Victor Pham


I use my phone before I sleep all the time and I see be get up better in the morning. Only downside for now is that the screen dimmer is not stronger enough.

Michael Kim

Screen overlay

Please update to resolve issue with Screen Overlay on new Samsung Galaxy S7 and Android Marshmallow.

myyk sony

Instant effect

I got better sleep since the first night.. got sleepy within 30 minutes..

Jamal Sankey

I liked the app a lot on Lollipop, but since the Marshmallow update it messes with Android Pay and other apps due to it drawing over other applications. Please fix this!

Amanda Donnelly

Love it but...

I have a flip cover on my phone with a window in it and my phone knows when it is open to wake up and when I shut it, the screen shrinks down to the size of the window and I can see notifications and what not on the smaller screen. I love all the features of the app and they work perfect on my regular screen but when I shut my case it goes right back to the bright blue lights. It hurts my eyes when I forget to turn my phone over first.

Scharmoo Johnston

Get this app.

This is a fantastic app, and it does help me get to sleep easier once I have finished doing whatever on my phone. If you find that you struggle with getting to sleep after looking at your phone screen, this is the app for you.

Saaquib Bakhsh

Interferes immensely with other apps like instagram and camera. No widget option for LG easy pause

Stop being Nosey

Still Great! Note 4