About this app

Are you using your smartphone or tablet in the late evening?
Blue Light Filter may be an ideal solution for you!

What is Blue Light Filter?
An app that effectively reduces the amount of blue light emitted from electronic devices by overlaying a translucent filter.
Great for those who use their devices all day long and are feeling fatigued.
It keeps the eyes healthy and helps users achieve comfortable sleep.
Besides the blue light filter, the screen dim feature will reduce the screen brightness to a minimum level as night mode.

Why you should use Blue Light Filter?
Research shows that exposure to blue light imposes serious threats to retinal neurons, causes eye strain, and dry eyes, and inhibits the secretion of melatonin, a hormone that influences circadian rhythms. With our filter function, your vision health will be greatly improved.
It is recommended to turn on this app when you are reading or playing games, especially in a dark room.

Features:
● Reduce blue light
● Adjustable filter intensity (Auto/Manual)
● Adjustable color temperature
● Brightness setup
● Schedule
● Built-in screen dimmer
● Caffeine mode

Reduce Blue Light
The screen filter can change your screen into natural color, so it can reduce the blue light which will affect your sleep.

Screen Filter Intensity
Set automatic filter intensity and screen dim based on readings from the light sensor, or do it manually

Adjustable color temperature
Set the filter color temperature in range from 0K till 5000K

Brightness setup
Fine tune the screen brightness including option to enable adaptive brightness

Schedule
Set the time of starting the filter and also ending it

Screen Dimmer
You can adjust your screen brightness accordingly, making the screen even darker than it is. Get better reading experience.

Eye Protector From Screen Light
Screen shift to night mode to protect your eyes and relieve your eyes in no time.

Caffeine mode
Prevents your screen from turning off, ideal for night reading

Why Blue Light Filter uses AccessibilityServices API
Enabling this type of service expands the range of capabilities so screen filter can cover system views such as:
- Status bar
- Navigation bar
- Lock screen

And remove overlay limitations:
- Not allowing app installation

* Since Android 12, accessibility service is needed in order to enable a screen filter.

Enabling this won't allow Blue Light Filter to access your screen content

Help translating:
https://www.paget96projects.com/help-translating-apps.html

Relevant Scientific studies
1. Steven W. Lockley, George C. Brainard, Charles A. Czeisler. “High Sensitivity of the Human Circadian Melatonin Rhythm to Resetting by Short Wavelength Light”. J Clin Endocrinol Metab. 2003 Sep;88(9):4502-5.

2. Burkhart K, Phelps JR. “AMBER LENSES TO BLOCK BLUE LIGHT AND IMPROVE SLEEP: A RANDOMIZED TRIAL”. Chronobiol Int. 2009 Dec;26(8):1602-12.

3. ----“Effects of blue lights technology”. https://en.wikipedia.org/wiki/Effects_of_blue_lights_technology

4. “How exposure to blue light affects your brain and body”. Nature Neuroscience; Harvard Health Publications; ACS, Sleep Med Rev, American Macular Degeneration Foundation; European Society of Cataract and Refractive Surgeons; JAMA Neurology

New features

v1.6.3
- Improved support with Android 14
- Minor UI changes
- Updated billing implementation
- Minor bug fixes and improvements
- Code optimization
- Updated libraries

App Permissions

Allows an application to read or write the system settings.
Allows access to the vibrator.
Allows an application to collect component usage statistics
Declaring the permission implies intention to use the API and the user of the device can grant permission through the Settings application.
Allows applications to open network sockets.
Allows applications to access information about networks.
Allows using PowerManager WakeLocks to keep processor from sleeping or screen from dimming.