Twilight

Twilight Free App

Rated 4.58/5 (290,173) —  Free Android application by Urbandroid Team

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About Twilight

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
http://en.wikipedia.org/wiki/Melatonin
http://en.wikipedia.org/wiki/Melanopsin
http://en.wikipedia.org/wiki/Circadian_rhythms
http://en.wikipedia.org/wiki/Circadian_rhythm_disorder

Permissions
- 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)
https://sites.google.com/site/twilight4android/automation

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.

How to Download / Install

Download and install Twilight version Varies with device on your Android device!
Downloaded 5,000,000+ times, content rating: Everyone
Android package: com.urbandroid.lux, download Twilight.apk

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App History & Updates

What's Changed
8.1
- fix for Android 5.X auto-pause in apps issues
- fix for Chromebooks
8.0
- Black quick settings tile panel with Android 8.1 and home screen filtering enabled
- Because of wallpaper filtering the app may require the storage permission on some phones, but if you are not using this you can revoke the permission after updating
- get rid of Accessibility option for auto-pause in apps as of new Play Store policies (if you are still using this, please re-configure)
More downloads  Twilight reached 5 000 000 - 10 000 000 downloads
More downloads  Twilight reached 1 000 000 - 5 000 000 downloads
Version update Twilight was updated to version 3.6
Version update Twilight was updated to version 3.4

What are users saying about Twilight

J70%
by J####:

Does one job and does it well. Once set up (<5 minutes), you will forget that it's even installed. Make sure to use the 'Auto-pause in apps' feature for banking apps and similar; Twilight effectively has access to everything on the screen in order to do its job, which (understandably) freaks certain apps out. I also blacklist my camera and photo viewing/editing apps to keep colours correct.

X70%
by X####:

Way better this time around an update must have fixed the problem of the filter not staying on. I like this filter at night to read or play a game a few minutes before bed. Without this app the phone is just too bright, ouch! It's an added bonus I'll get more sleep. ????

C70%
by C####:

Since the recent update, this app doesn't work automatically. So I should open the app, after I turned on or rebooted my phone, to make this app work. I've never had this problem before

C70%
by C####:

Been using for a few months and definitely helps adjust to sleeping. App is sometimes slow to respond and freezes ocassionally.

C70%
by C####:

Excellent app works great. Installed in al my phones . Reduces eye strain a lot . Can find lots of difference whule reading

J70%
by J####:

I found out about this through one of wengie's life back videos and it really works! 5 stars!

C70%
by C####:

This app is simple but works great! Makes the light from the phone so much easier on your eyes early and late in the day!

A70%
by A####:

If, after it activated and I subsequently adjusted the brightness it didn't try to reset to its initial setting I'd give it a 5

C70%
by C####:

Honestly has helped feeling better at night. Best filter out there. It doesn't blur the screen like others. Good quality app

S70%
by S####:

Lately, widget are not shown. I tried reinstalling, but again after 1-2 days, widget were gone. Need to fix it????

C70%
by C####:

It's pretty cool. I don't have issues with sleep but the warm hues definitely help my sensitive eyes.

U70%
by U####:

Its alright but there's abit of a glitch, my lock screen stayed dimmed and has the red ish tint (from the blue light filter feature) even after i closed the app and stopped it from running in the background, had to restart my phone just to get the lock screen look normal again. But the problem keeps popping up whenever i use the app or does so itself after installation on an update. Please fix it. Thanks.

L70%
by L####:

I think I should routine checkup my eyes. It may be possible some eye problem .

D70%
by D####:

This app has greatly helped my eyes to feel more healthy and less sensitive to Blue Light of my cell phone! Excellent app!

C70%
by C####:

I have been using these app for 30 minutes and I haven't felt sleepy yet

C70%
by C####:

It has no ads, instant 5 stars

G70%
by G####:

Great. Does everything you want without being evasive or bugging you with pop ups and adds.

C70%
by C####:

Must and should ......all use this app....it really helps from head ache....and eye

C70%
by C####:

Why not update the new permission system in Android

G70%
by G####:

I paid the payment for pro twice. Amount debited from my card but no access at all.

Z70%
by Z####:

Got better sleep and woke up well rested with more energy throughout the day.

C70%
by C####:

My phone's lowest brightness setting is near that of most phone's highest and this app is a life saver

S70%
by S####:

Why don't my status bar and lower menu buttons get affected?

G70%
by G####:

Before my eyes hurt and now they are fine!

C70%
by C####:

My eyes have started loving me again...thanks twilight ????

C70%
by C####:

Love it really helps me to sleep at night.

C70%
by C####:

Excelente y sin ads

C70%
by C####:

Now that they've fixed the auto-pause feature, it's perfect

C70%
by C####:

Really many thanks to the developer for their dedicated night mode app

C70%
by C####:

Best app ever it helps your eyes (must download ????????)

C70%
by C####:

Hell Right krrkekrlh

C70%
by C####:

Love the fact that it can automatically turn on from sunset to sunrise.

C70%
by C####:

Awesome app....but it's not always working..... especially from notification toggle.......

C70%
by C####:

Please add some 3rd party apps supports

X70%
by X####:

Does what it says. A more gentle light at night.

C70%
by C####:

Very helpful. So I bought donation package.

C70%
by C####:

Best low light viewing on the app store.

C70%
by C####:

This app really helps my eyes

O70%
by O####:

Helps me get too sleep faster

X70%
by X####:

It helped me sleep way better


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Rating Distribution

RATING
4.65
290,173 users

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