A different kind of blue filter android app, enabling the built in black and white mode in android without the use of an overlay screen
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This app makes use of the built-in black and white device feature to provide a blue-light filtered screen without the use of an overlay screen, to help relax your eyes at night and disincentivise phone usage.

Get it on F-Droid

Get it on the Play Store

ADB command to grant required permission: adb shell pm grant uk.co.richyhbm.monochromatic android.permission.WRITE_SECURE_SETTINGS