Twilight: Blue light filter (PRO) 14.3 Apk for Android

Struggling to Fall Asleep?

Are your children hyperactive after playing with their tablets before bedtime? Do you find yourself using your smartphone or tablet late into the evening? If you are sensitive to light during migraines, Twilight may be the solution you need!

The Science Behind Sleep Disruption

Recent studies indicate that exposure to blue light before sleep can disrupt your natural circadian rhythm, making it difficult to fall asleep. The culprit? A photoreceptor in your eyes known as Melanopsin. This receptor is particularly sensitive to blue light in the 460-480nm range, which can suppress the production of Melatonin, the hormone essential for healthy sleep-wake cycles.

Experimental research shows that an average person reading on a tablet or smartphone for a couple of hours before bedtime may experience a delay in sleep onset by approximately one hour. For more details, see the references below.

Introducing the Twilight App

The Twilight app adjusts your device's screen to suit the time of day. It filters the blue light emitted by your phone or tablet after sunset, providing a soft and pleasant red filter that protects your eyes. The filter's intensity is smoothly adjusted according to the local sunrise and sunset times.

You can also use Twilight on your Wear OS device.

Get More from Twilight

• Bed Reading: Twilight is gentler on the eyes for nighttime reading, lowering the screen backlight far below the capabilities of standard backlight controls.


• AMOLED Screens: After five years of testing on AMOLED screens, Twilight has shown no signs of depletion or over-burning. When properly configured, it reduces light emission while ensuring even light distribution, potentially increasing the lifespan of your AMOLED screen.

Understanding Circadian Rhythm and Melatonin

For more information on circadian rhythms and the role of melatonin, check out these resources:

• Melatonin


• Melanopsin


• Circadian Rhythms


• Circadian Rhythm Disorder

Permissions Needed

To function optimally, Twilight requires the following permissions:

• Location: To determine your current sunset and sunrise times.


• Running Apps: To pause Twilight in selected applications.


• Write Settings: To adjust backlight settings.


• Network: To access smart lights (e.g., Philips HUE) to shield your household from blue light.

Accessibility Service

To filter notifications and the lock screen, the app may request enabling the Twilight Accessibility Service. This service is used solely to enhance screen filtering and does not collect personal information. For more details, visit here.

Wear OS Integration

Twilight syncs your Wear OS screen with your phone's filter settings, allowing you to control filtering from a Wear OS Tile.

Automation Options

For automation capabilities, check out this link.

Related Scientific Research

1. 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


2. Exposure to Room Light before Bedtime Suppresses Melatonin Onset and Shortens Melatonin Duration in Humans - Joshua J. Gooley et al., 2011


3. Effect of Light on Human Circadian Physiology - Jeanne F. Duffy & Charles A. Czeisler, 2009


4. Efficacy of a single sequence of intermittent bright light pulses for delaying circadian phase in humans - Claude Gronfier et al., 2009


5. Intrinsic period and light intensity determine the phase relationship between melatonin and sleep in humans - Kenneth P. Wright et al., 2009


6. The Impact of Sleep Timing and Bright Light Exposure on Attentional Impairment during Night Work - Nayantara Santhi et al., 2008


7. Short-Wavelength Light Sensitivity of Circadian, Pupillary, and Visual Awareness in Humans Lacking an Outer Retina - Farhan H. Zaidi et al., 2007