Twilight: Blue light filter

Installs

13.1m

Rating

4.5

Rating count

437.6k

Category	Health & Fitness
Developer	Petr Nálevka
Price	Free
First release	3/5/2013 (13 years ago)
Version	VARY
In-app purchases	No
Contains ads	No
Content rating	PEGI 3
Package name	com.urbandroid.lux

View on Play Store

Core Metrics

Data Breakdown

Date	Rating Count	Average Rating	Installs	Version
9/5/2025	437,612	4.537	13,102,671	VARY
9/4/2025	437,584	4.538	13,102,671	VARY
8/26/2025	437,272	4.528	13,089,870	VARY
8/25/2025	437,247	4.525	13,088,908	VARY
8/24/2025	437,219	4.525	13,086,443	VARY
8/23/2025	437,200	4.525	13,086,443	VARY
8/22/2025	437,166	4.523	13,083,592	VARY
8/21/2025	437,123	4.571	13,082,977	VARY
8/20/2025	437,084	4.566	13,081,780	VARY
8/19/2025	437,052	4.566	13,081,698	VARY
8/13/2025	436,841	4.529	13,073,879	VARY
8/11/2025	436,765	4.571	13,069,782	VARY
8/10/2025	436,728	4.567	13,069,782	VARY
8/9/2025	436,689	4.569	13,067,385	VARY
8/8/2025	436,643	4.569	13,066,694	VARY
8/7/2025	436,595	4.570	13,065,798	VARY
8/6/2025	436,561	4.571	13,063,279	VARY
8/3/2025	436,449	4.575	13,061,115	VARY
8/2/2025	436,415	4.575	13,058,308	VARY
8/1/2025	436,381	4.574	13,057,338	VARY
7/31/2025	436,346	4.577	13,056,176	VARY
7/14/2025	435,699	4.495	13,034,893	VARY
6/20/2025	434,861	4.505	13,005,606	VARY
6/19/2025	434,832	4.502	13,004,316	VARY
6/18/2025	434,801	4.501	13,002,898	VARY
5/29/2025	434,497	4.498	12,989,094	N/A
5/28/2025	434,238	4.496	12,977,306	N/A
5/27/2025	434,216	4.496	12,976,247	N/A
5/24/2025	434,188	4.494	12,972,317	N/A
5/22/2025	434,100	4.494	12,969,985	N/A
5/21/2025	434,047	4.495	12,966,054	N/A
5/20/2025	434,008	4.494	12,966,054	N/A
4/24/2025	433,352	4.478	12,935,038	N/A
4/22/2025	433,189	4.474	12,923,567	N/A
4/15/2025	433,165	4.473	12,923,567	N/A
4/10/2025	432,994	4.467	12,919,904	N/A
4/6/2025	432,890	4.469	12,912,335	N/A

Details

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

More Apps byPetr Nálevka

Sleep as Android: Smart alarm

Installs: 23,970,989Score: 4.72Ratings: 385,172

Price: N/A

Version: N/AReleased: 10/24/2010Last change: N/A

BabySleep: Whitenoise lullaby

Installs: 5,761,021Score: 4.73Ratings: 74,612

Price: N/A

Version: N/AReleased: 8/13/2013Last change: N/A

Digital Detox: Focus & Live

Installs: 1,516,975Score: 4.58Ratings: 35,783

Price: N/A

Version: N/AReleased: 8/11/2015Last change: N/A

Sleep as Android Unlock

Installs: 1,363,857Score: 4.77Ratings: 38,516

Price: N/A

Version: N/AReleased: 10/28/2010Last change: N/A

KineStop: Car sickness aid

Installs: 860,763Score: 4.84Ratings: 8,734

Price: N/A

Version: N/AReleased: 8/16/2018Last change: N/A

Twilight Pro Unlock

Installs: 365,691Score: 4.70Ratings: 8,778

Price: N/A

Version: N/AReleased: 3/5/2013Last change: N/A

PoKeMoney: Scan,Trade,Eval TCG

Installs: 156,880Score: 3.85Ratings: 345

Price: N/A

Version: N/AReleased: 4/11/2023Last change: N/A

Lullaby pack Sleep + Mindroid

Installs: 125,267Score: 3.67Ratings: 2,968

Price: N/A

Version: N/AReleased: 2/17/2013Last change: N/A

Mindroid PRO Unlock

Installs: 85,808Score: 0.00Ratings: 0

Price: N/A

Version: N/AReleased: 1/12/2013Last change: N/A

Baby Sleep PRO

Installs: 53,260Score: 0.00Ratings: 0

Price: N/A

Version: N/AReleased: 8/13/2013Last change: N/A

PowerLine PRO Unlock

Installs: 22,377Score: 0.00Ratings: 0

Price: N/A

Version: N/AReleased: 6/11/2013Last change: N/A

SayIt Full Unlock

Installs: 8,535Score: 4.27Ratings: 208

Price: N/A

Version: N/AReleased: 7/8/2015Last change: N/A

More Apps inHealth & Fitness

Actively: Step Tracker, Reward

Installs: 60,290Score: 4.56Ratings: 2,579

Price: N/A

Version: N/AReleased: 12/19/2023Last change: N/A

Silvia - cognitive games

Installs: 123,639Score: 4.36Ratings: 298

Price: N/A

Version: N/AReleased: 7/11/2021Last change: N/A

HR2VP Watch Bike Computer

Installs: 4,015Score: 0.00Ratings: 0

Price: N/A

Version: N/AReleased: 12/29/2023Last change: N/A

Run Tracker - Run Weight Loss

Installs: 1,717,149Score: 4.75Ratings: 13,141

Price: N/A

Version: N/AReleased: 3/29/2022Last change: N/A

MadFit: Workout At Home, Gym

Installs: 358,532Score: 0.00Ratings: 0

Price: N/A

Version: N/AReleased: 7/30/2021Last change: N/A

Meditopia: Sleep & Meditation

Installs: 21,390,760Score: 4.37Ratings: 275,544

Price: N/A

Version: N/AReleased: 3/7/2017Last change: N/A

Pilates Anytime Workouts

Installs: 166,434Score: 4.57Ratings: 706

Price: N/A

Version: N/AReleased: 11/10/2019Last change: N/A

Serenity: Guided Meditation

Installs: 2,264,418Score: 5.00Ratings: 53,900

Price: N/A

Version: N/AReleased: 8/30/2018Last change: N/A

Weight Loss by Walking

Installs: 114,896Score: 4.28Ratings: 231

Price: N/A

Version: N/AReleased: 12/13/2021Last change: N/A

Dance Workout For Weightloss

Installs: 2,129,390Score: 4.20Ratings: 13,344

Price: N/A

Version: N/AReleased: 4/7/2022Last change: N/A

YOGA for Beginners

Installs: 2,547,267Score: 4.82Ratings: 75,369

Price: N/A

Version: N/AReleased: 7/27/2020Last change: N/A

Map My Run GPS Running Tracker

Installs: 17,281,834Score: 4.87Ratings: 447,750

Price: N/A

Version: N/AReleased: 9/9/2010Last change: N/A

Sprint - Food & Workout App

Installs: 44,173Score: 4.12Ratings: 1,202

Price: N/A

Version: N/AReleased: 5/2/2020Last change: N/A

루나런클럽 - 나이키런클럽, 런데이, 러닝 데이터 연동

Installs: 4,569Score: 4.53Ratings: 110

Price: N/A

Version: N/AReleased: 11/10/2024Last change: N/A

SyncMyTracks

Installs: 98,032Score: 3.52Ratings: 5,039

Price: N/A

Version: N/AReleased: 2/18/2014Last change: N/A

Maya - Period & Health

Installs: 9,949,495Score: 4.79Ratings: 250,697

Price: N/A

Version: N/AReleased: 12/8/2011Last change: N/A

Calorie Counter・Planner・DietAI

Installs: 2,660,746Score: 4.68Ratings: 96,892

Price: N/A

Version: N/AReleased: 9/29/2024Last change: N/A

Ffion Online

Installs: 53Score: 0.00Ratings: 0

Price: N/A

Version: N/AReleased: 5/22/2025Last change: N/A

Wahoo SYSTM

Installs: 217,736Score: 0.00Ratings: 0

Price: N/A

Version: N/AReleased: 9/13/2021Last change: N/A

Bom Calendar - Period tracker

Installs: 536,815Score: 4.92Ratings: 28,089

Price: N/A

Version: N/AReleased: 11/7/2017Last change: N/A

Strong Workout Tracker Gym Log

Installs: 3,592,359Score: 4.78Ratings: 41,938

Price: N/A

Version: N/AReleased: 4/9/2017Last change: N/A

Pulsebit: Heart Rate Monitor

Installs: 2,087,674Score: 4.26Ratings: 17,033

Price: N/A

Version: N/AReleased: 8/20/2021Last change: N/A

Boostcamp: Gym & Fitness Coach

Installs: 409,569Score: 4.92Ratings: 10,999

Price: N/A

Version: N/AReleased: 11/3/2020Last change: N/A

혈당 착착 - 혈당 기록, 당뇨 관리

Installs: 5,503Score: 4.68Ratings: 221

Price: N/A

Version: N/AReleased: 5/5/2024Last change: N/A

Relaxing Sounds for Sleeping

Installs: 588,067Score: 4.20Ratings: 8,538

Price: N/A

Version: N/AReleased: 2/27/2023Last change: N/A

JuggernautAI

Installs: 88,871Score: 4.63Ratings: 2,406

Price: N/A

Version: N/AReleased: 12/19/2020Last change: N/A

ShutEye®: Sleep & Relax

Installs: 8,736,140Score: 4.70Ratings: 98,018

Price: N/A

Version: N/AReleased: 10/13/2022Last change: N/A

Step Tracker - Count My Steps

Installs: 2,301,174Score: 4.55Ratings: 28,425

Price: N/A

Version: N/AReleased: 6/4/2018Last change: N/A

Maumgyeol Mini

Installs: 8,207Score: 4.56Ratings: 25

Price: N/A

Version: N/AReleased: 12/15/2023Last change: N/A

Endel: Focus, Relax & Sleep

Installs: 1,809,961Score: 4.92Ratings: 16,431

Price: N/A

Version: N/AReleased: 5/29/2019Last change: N/A

시크릿다이어트

Installs: 7,069Score: 4.55Ratings: 48

Price: N/A

Version: N/AReleased: 1/2/2019Last change: N/A

Bluelight Filter for Eye Care

Installs: 23,102,008Score: 4.06Ratings: 347,374

Price: N/A

Version: N/AReleased: 9/14/2013Last change: N/A

Freediving Apnea Trainer

Installs: 399,528Score: 4.87Ratings: 5,269

Price: N/A

Version: N/AReleased: 2/8/2017Last change: N/A

Fasting App & Calorie Counter

Installs: 1,110,354Score: 4.78Ratings: 28,692

Price: N/A

Version: N/AReleased: 4/28/2023Last change: N/A

Lose Belly Fat | Abs 30 Days

Installs: 2,131,499Score: 4.88Ratings: 32,368

Price: N/A

Version: N/AReleased: 5/19/2020Last change: N/A

APECS: Body Posture Evaluation

Installs: 551,836Score: 4.38Ratings: 1,434

Price: N/A

Version: N/AReleased: 7/27/2018Last change: N/A

Go back to the Home page