Blue Light Filter

Blue Light Filter overlays a translucent filter on your screen to cut blue light. It helps ease eye strain and tired eyes, and at night it gently dims the screen with a warm tint to support better sleep. Enjoy a screen that's easy on your eyes all day long.

The blue light from phone and tablet LED screens is said to affect eye comfort and sleep quality. With this app you can cut blue light in a single tap. The filter color and strength are fully adjustable, so even a too-bright screen at night becomes comfortably soft.


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Great for people who want to:
・Ease eye strain and tired eyes
・Be kinder to their eyes when using the phone before bed
・Switch the filter automatically for each app
・Toggle quickly from the notification bar or a widget
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[Features]

►Filter settings
Freely adjust the filter color and strength to suit your eyes.

►Quick control from the notification bar
Turn the filter on/off or change its strength in one tap from the notification bar. You can also choose to hide the notification.

►Per-app filter settings
Automate the filter on/off for each app. The filter you set kicks in when you open the target app, and reverts when you close it.

►Timer settings
Automatically turn the filter on/off every day at the times you set. The blue light cut kicks in automatically when night comes.

►Widget & Quick Settings tile
Toggle the filter in one tap from a home-screen widget or the Quick Settings panel.

►Simple, easy-to-understand design
Just the features you need, intuitively laid out. Easy to use even for first-timers.


This app uses the Accessibility service.
It is used to detect which app has started or stopped, so the filter behavior can be switched per app. This information is never stored or shared.


[For HUAWEI device users]
Some HUAWEI devices are set by default not to auto-restart apps after a reboot. In that case, please set the following:
Device Settings → Battery → App launch → set the app you want to auto-start to "Manage manually".


[For OPPO device users]
This app needs to run a background service that detects which app has started.
Due to OPPO's unique behavior, special settings are required to keep an app's service running in the background. (Without them, the background service is force-stopped and the app won't work properly.)
In the recent-apps list, drag this app down a little to lock it. If you're not sure how, search for "OPPO task lock".