Twilight: Blue light filter
Filters blue light from your screen, reduces eye strain and helps you sleep
App info
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App description
Android App Analysis and Review: Twilight: Blue light filter, Developed by Petr Nálevka (Urbandroid). Listed in Health & fitness Category. Current Version Is v6q, Updated On 13/03/2025 . According to users reviews on Google Play: Twilight: Blue light filter. Achieved Over 13 million Installs. Twilight: Blue light filter Currently Has 433 thousand Reviews, Average Rating 4.6 Stars
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? Are you sensitive to light during migraine?
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. See references below..
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.
You can also use Twilight on your Wear OS device.
Documentation
http://twilight.urbandroid.org/doc/
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 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
Accessibility Service
In order to filter also your notifications and lock screen the app may ask for enabling Twilight Accessibility Service. The app uses this service only to better filter your screen and does not collect any personal information. Please read more about this at https://twilight.urbandroid.org/is-twilights-accessibility-service-a-thread-to-my-privacy/
Wear OS
Twilight also syncs your Wear OS screen with your phone's filter settings. You can control filtering from a "Wear OS Tile".
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 & Co 2008
Short-Wavelength Light Sensitivity of Circadian, Pupillary, and Visual Awareness in Humans Lacking an Outer Retina Farhan H. Zaidi & Co, 2007
We are currently offering last version updated 13/03/2025 . This is our latest, most optimized version. It is suitable for many different devices. Free download directly apk from the Google Play Store or other versions we're hosting. Moreover you can download without registration and no login required.
We have more than 2000+ available devices for Samsung, Xiaomi, Huawei, Oppo, Vivo, Motorola, LG, Google, OnePlus, Sony, Tablet ... with so many options, it’s easy for you to choose games or software that fit your device.
It can come in handy if there are any country restrictions or any restrictions from the side of your device on the Google App Store.
What's New
- Targeting Android 15
- Edge to edge support
- Fix for scrolling to last option and large DPI settings
- New libraries
- Edge to edge support
- Fix for scrolling to last option and large DPI settings
- New libraries
Rate and review on Google Play store
Total number of ratings
Total number of active users rated for: Twilight: Blue light filterTotal number of installs (*estimated)
Estimation of total number of installs on Google Play, Approximated from number of ratings and install bounds achieved on Google Play.You may also like these apps
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Recent Comments
Teddy J
Phenomenal app. It's easy to use, reliable, and wonderfully flexible. The quick-settings tile is amazing - for years and years I've had it set up so Twilight is on the first page for easy access whenever I open up the notification tray. I love that I can long-press it to open up the app too. No ads, too! I can't praise it enough for the years of good, straightforward utility it's provided me.
Jonathan Hicks
This one actually works! I've tried four or five other dimmer apps. Some of them had the dimming temperature wrong, some of them had a "flashlight" button next to the "dim" button, causing you to blind your partner while you sleep, some of them just didn't work without messing with disability settings! This one worked out of the box with minimal tinkering, has a VERY workable user interface, and doesn't turn my flashlight on when I want to dim my screen. I don't write reviews but this was worth!
Wyatt McGhee
Excellent app for filtering blue light at night; screen is much easier on the eyes. You can customize the hours or set from sunset to sunrise, BUT the "schedule profile" function is confusing. I wish the slidebar was not the only way to set custom times! It would also be helpful if there was an on/off feature to more easily tell if app is currently on or off.
Heather Vandegrift
I've used Twilight for years. I download it on every new phone and keep it running constantly. As someone with chronic migraines, light is very problematic for me. I love that Twilight not only allows you to select the color temperature that is best for you, but the ability to change the intensity is great for times when I need to use my phone but really need that blue light GONE, AND ability to dim the screen beyond the phone's default settings is a godsend for using this at night!
The Present Moment
This app is the best one for getting rid of blue light and adding a red light filter over the screen. It has loads of settings too, which is really cool to play around with. You can also create 1 profile for the settings. You get a little more access to extra features in settings if you upgrade to Pro. If you know anything about blue light and what it really does to the body, you'll totally eliminate it with this app. Look up Dr. Jack Kruse and dive deep down the rabbit hole of truth about .....
A Google user
It is 2024. Been using since 2016!. Best blue screen protection ever. The most important health function on my Android. Set up to increase filter sunset to sun up but I can turn off on demand. I do turn off when I watch movies. 2016 Review (all still true): Been using for about 4 months. I am a news junkie. Wake up at 2am? I check in on news. Since using twilight, I noticed I go back to sleep easy as pie. Been getting a couple more hrs of sleep routinely. Changing my life!
Prosna
Been using this app for years. I love that you can adjust the color and it has its own timer that activates according to the time of day. It's effortless to use and really softens the screen colors to my preference. Makes it so if I need to check my phone late in the day, I don't have to be concerned with the blinding blue light. Twilight eliminates that problem while still keeping the screen easy to read. Never had an issue. Excellent app.
Jen P
Been using this more than 3 years now and never had an issue ... Until the last 2 months. Every time I clear notifications, Twilight becomes disabled. I'm not doing anything to the app itself, just clearing notifications from the pulldown menu and, POOF! It's gone and I have to reset it all over again. It's nothing major, just super annoying having to do it 10+ times per day.