Blue Light Filter

The blue light from the LED screen on your phone or tablet is often said to tire your eyes and affect how easily you fall asleep. Blue Light Filter lays a warm, semi-transparent filter over the whole screen, softening glare so the display is easier to look at. In bed at night or in a dark room, reading and watching stay comfortable.

Strength goes from 0% to 100%, and you can pick one of eight preset colors or build your own. Set the timer and the per-app rules once, and the filter turns itself on and off exactly when you need it. Taps and swipes pass straight through to the app underneath, and it comes back in the same state after a restart.


【MAIN FEATURES】

►Strength from 0% to 100%
Drag the slider for fine control, or tap + and − to move in steps of 5%. The current level is shown as a large number, so you always know how much filtering is applied.

►Eight presets plus a custom color
Pick from eight colors, from warm tones through yellow, green and grey. The custom color adds hue, saturation and brightness sliders with a live HEX value, a preview before you apply, and a reset.

►Timer for automatic on and off
Set a start and an end time and the filter switches every day on its own, including ranges that cross midnight such as 18:00 to 6:00. It shows when the next change is due.

►Per-app switching
For each app choose Filter on, Filter off, or Do not change. Apps where color matters, such as photos, video and the camera, turn it off automatically and it returns when you leave. Search by name or list only the apps you configured.

►One tap from the notification bar
A control panel in the notification bar changes the filter and its strength without opening the app. Show it always, only while the filter is on, or never. It never makes a sound or vibrates.

►Widget and Quick Settings tile
The 1x1 home screen widget toggles the filter with one tap and its color shows whether the filter is active. The Quick Settings tile does the same from any screen.

►Light, dark and automatic themes
Choose a light or dark look, or let the app follow your device. The notification panel follows the theme too.

►14 languages
Available in 14 languages, including English, Japanese, German, Spanish, French and Korean.

【THREE STEPS TO START】
1. Open the app and allow accessibility when prompted
2. Turn the filter switch on
3. Adjust strength and color until the screen suits your eyes


【FAQ】

Q. How is this different from lowering the screen brightness?
A. It goes darker than the lowest brightness your device allows, and it shifts the screen to a warm tone with less blue, which brightness alone cannot do.

Q. Does it appear in screenshots and screen recordings?
A. Yes. The filter is drawn on top of the screen, so its color is captured too.

【TRY EVERYTHING FREE FOR 2 DAYS】
Every feature is unlocked for two days after you install, with no limits. To keep it after that, buy the full version unlock in the app. It is a one-time purchase, not a subscription, and there are no ads.

This app uses the accessibility service.
It is used to display the filter over the screen. It is also used to detect which app has started or stopped, so the filter can switch per app. This information is never stored or shared.


【FOR HUAWEI USERS】
Some HUAWEI devices do not restart apps after a reboot. Go to Device settings → Battery → App launch and set this app to "Manage manually".


【FOR OPPO USERS】
This app needs a background service to detect which app has started.
OPPO devices are customized, so a special setting is required to keep that service alive. (Without it the service is killed and the app cannot work properly.)
Open the recent apps list, drag this app down slightly and lock it. If unsure, search for "OPPO task lock".


【REQUIREMENTS】
Android 8.0 or later

Recent changes:
Improvements & bug fixes

• Changed the filter to turn off instead of staying on when the accessibility service stops and the filter can't be shown, and added guidance in the app on how to fix it
• Improved the filter to reappear right away after the system closes the app
• Fixed an issue where the Quick Settings tile sometimes couldn't switch the filter