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Download Twilight: Blue light filter 5.9 APK
Target: Android 5.0 (Lollipop, API 21)
What's new in Twilight: Blue light filter 5.9
5.9
- Spanish, French, Korean texts (many thanks!)
- fixes in exclude apps from filtering
- fix in alarm based filter times
5.7
- various fixes, updated Spanish (big thanks to Santiago)
5.6
- Android Wear, Android TV
- faster restarting when killed on low memory
- auto-pause in apps for Android L & M
- fix for filter times: alarm when not using Sleep as Android
5.4
- fix for widgets after boot
5.3
- sunset/sunrise offset, tablet layouts
About Twilight: Blue light filter 5.9
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!
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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.
Twilight: Blue light filter 5.9 variants
This release may come in several variants. Consult our handy FAQ to see which download is right for you.
Version:14.5
Uploaded:September 17, 2025 at 10:34AM UTC
File size:6.90 MB
Version:7.0(206) for Android 2.3+ (Gingerbread, API 9)
Uploaded:January 12, 2017 at 8:18PM UTC
File size:4.52 MB
Downloads:1,681
Version:6.9(192) for Android 2.3+ (Gingerbread, API 9)
Uploaded:November 25, 2016 at 7:14PM UTC
File size:4.31 MB
Downloads:677
Version:6.7(185) for Android 2.3+ (Gingerbread, API 9)
Uploaded:October 17, 2016 at 7:03PM UTC
File size:4.05 MB
Downloads:548
Version:6.8(179) for Android 2.3+ (Gingerbread, API 9)
Uploaded:September 29, 2016 at 1:06PM UTC
File size:4.05 MB
Downloads:1,682
Version:6.6(177) for Android 2.3+ (Gingerbread, API 9)
Uploaded:July 18, 2016 at 6:26PM UTC
File size:5.26 MB
Downloads:949
Version:6.5(173) for Android 2.3+ (Gingerbread, API 9)
Uploaded:June 13, 2016 at 5:38PM UTC
File size:5.26 MB
Downloads:362
Version:6.3(163) for Android 2.3+ (Gingerbread, API 9)
Uploaded:March 29, 2016 at 4:07PM UTC
File size:4.97 MB
Downloads:1,499
Version:5.9(149) for Android 2.3+ (Gingerbread, API 9)
Uploaded:February 22, 2016 at 7:01PM UTC
File size:4.62 MB
Downloads:559
Version:5.7(144) for Android 2.3+ (Gingerbread, API 9)
Uploaded:February 17, 2016 at 8:32PM UTC
File size:4.60 MB
Downloads:298
Version:5.6(138) for Android 2.3+ (Gingerbread, API 9)
Uploaded:February 1, 2016 at 4:10PM UTC
File size:4.60 MB
Downloads:576
Version:14.25
Uploaded:February 9, 2026 at 12:04PM UTC
File size:10.66 MB
Downloads:391
Version:14.24
Uploaded:February 5, 2026 at 5:14PM UTC
File size:10.66 MB
Downloads:22
Version:14.22
Uploaded:January 22, 2026 at 6:14PM UTC
File size:10.71 MB
Downloads:39
Version:14.21
Uploaded:January 6, 2026 at 9:40AM UTC
File size:10.61 MB
Downloads:46
Version:14.20
Uploaded:December 18, 2025 at 6:55AM UTC
File size:10.61 MB
Downloads:302
Version:14.17
Uploaded:November 27, 2025 at 3:49PM UTC
File size:9.26 MB
Downloads:87
Version:14.15
Uploaded:November 26, 2025 at 6:46PM UTC
File size:9.99 MB
Downloads:97
Version:14.14
Uploaded:November 10, 2025 at 7:59AM UTC
File size:9.61 MB
Downloads:64
Version:14.10
Uploaded:September 24, 2025 at 1:34PM UTC
File size:9.25 MB
Downloads:131
Version:14.7
Uploaded:August 6, 2025 at 3:09PM UTC
File size:9.00 MB
Downloads:137
