When using the Twilight application, the brightness of the phone can change to protect the user's eyes during potentially hazardous moments. This also works indoors and out; just adjust the brightness based on where the user is when adjusting the brightness. Twilight monitors the user's surroundings through protocols specific to the phone; it adjusts brightness accordingly even when it is brightest angle.

This app provides users with a variety of useful light filters. These include alarm, custom, always, and sun options. Some people don’t like the automatic brightness correction feature and opt to use other filters instead. The different options offer different effects and capabilities. They also come with many customization options to meet individual needs. Additionally, the options' filters constantly change to help the eyes adjust to a wide variety of light that's both healthy and friendly.

Twilight is a light that reduces the intensity of Bluelight, the common name for lights that cause eye strain or fatigue when used in the dark. Twilight can protect the eyes and help users get a good night's sleep if it's used around Bluelight for a long time. It can also improve sleep quality if it's been used for a long time without protection. This app can also provide more methods to help users sleep better if Bluelight has been exposed to them for a long time.

Adapting to a variety of light conditions is beneficial to the eyes and is easier to achieve through constant adjustment in light intensity. This allows the app to be used by people with a wide range of eye conditions, such as myopic or astigmatic vision. Furthermore, it can be used by anyone in real time and will automatically adjust the light based on the current environmental conditions. This way, it can even reduce risk of any damage to the eyes.

Twilight synchronizes all its user data, including their eyes, and connects with other platforms to help protect the eyes. It can also interfere with any light reflection to help protect the eyes when viewing any moment, place or detail. Additionally, this application can change a user's color or screen settings without hurting their eyes.

The app provides helpful guidelines for restful sleep. Since the blue light its going to protect your eyes can provide for years, these updates have been made available to all users. It's because of this recent reformulation that people with sleep disorders can benefit from its use. Some people struggle to sleep when exposed to light from many different sources. Twilight helps remedy this by providing tutorials and additional information about eye health. It also provides a safe haven for users' eyes, shielding them from the harmful effects of blue light. Twilight also provides tremendous benefits due to its immense popularity.

The application helps reduce mobile devices' blue light to protect all eyes!

Many articles warn about the impact of blue light from mobile devices on the body. These articles often talk about how exposure to blue light in a dark room causes severe eye damage. Modern technology has a lot of harmful side effects. Some people even experience sleep problems due to its effects. Children especially struggle with the effects of blue light, which can make them hyperactive, excited or depressed. Using a tablet or cell phone for too long before bed can make it harder to sleep. Instead, consider limiting use to a specific time of the day. Before sleep, a person's body needs a natural cycle; in this case, the production and release of Melatonin. This hormone is why people are able to wake and fall asleep at regular intervals. However, reading on a tablet or smartphone before bed can negatively affect the production of Melatonin. This is because the light receptors in one's eyes, called melanopsin, are sensitive to a narrow band of blue light that can block its production. Consequently, this causes difficulty falling asleep and waking up later than usual. When someone is exposed to blue light before sleep, their circadian rhythm — the natural cycle of day and night — can be disrupted. This can make them unable to sleep or even cause mood and nerve issues during the day. Twilight is a small app that helps protect a person's eyes from damaging glare. It's useful for anyone who frequently uses their mobile device in low-light conditions.

After sunset, the Twilight app reduces the blue light coming from your phone or tablet. This mimics the way your eyes naturally process blue light and gives them time to rest. It also adjusts the filter intensity to adapt to the time of day based on sunrise and sunset times where you live. Twilight reduces the amount of light emitted from a device's screen, making it harder to notice any negative effects it has on your health. This is helpful for users who are trying to fall asleep or who want to read in bed. Reading Twilight at night makes you more relaxed because it allows the mobile's screen to reduce its backlight intensity much lower than usual. This allows the blue light emitted by the screen to less directly impact the viewer's eyes than usual; it also reduces their fatigue.

Using the app helps you fall asleep more easily since it lessens your fatigue.ily even when you are forced to work for a long time on mobile devices at night.

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

The brightness can be adjusted automatically.
Various light filters for manual adjustment are available.
Absolute Blue Light Protection.
Quickly schedule your profile.
From a variety of platforms, work and sync.
A good night's sleep requires heedful consideration of some great advice.
Explain Twilight through proper means.
How harmful is blue light from mobile devices?
What does the Twilight franchise give you?
Additional effects that last longer than the initial effect.

// Option A //

To download Twilight: Blue light filter mod from HappyMod.com.
You need enable the option "Unknown Sources".
1. Click on the above link to download Twilight: Blue light filter mod APK.
2. Save the file in your device Downloads folder.
3. Now tap on Install and wait for the installation to finish.
4. Once it is done, open the game and start playing it right away.

// Option B //

To download Twilight: Blue light filter from HappyMod APP, you can follow this:
1. Open your browser and download the HappyMod APK file from HappyMod.com - the only official website of HappyMod.
2. Open Android Settings and go into Privacy or Security.
3. Tap the option to Allow Unknown Sources and enable it.
4. Go to your Android downloads and tap the APK file.
5. Follow the directions on the screen to install it.
6. Search Twilight: Blue light filter in HappyMod App.