Greyscale is a quick settings tile for Android which allows you to toggle a device between colour display and greyscale.

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In order to use Greyscale, you must manually grant it the WRITE_SECURE_SETTINGS permission, since this permission is not normally available to third party apps.

This can be done through adb by running the following from the command line:

adb shell pm grant io.github.rsookram.greyscale android.permission.WRITE_SECURE_SETTINGS

If you later wanted to remove the permission, you can run:

adb shell pm revoke io.github.rsookram.greyscale android.permission.WRITE_SECURE_SETTINGS

Once this is done, adding the quick settings tile is all that's left to do before you can use it.

This same option exists under Developer Options > Simulate color space, but it's convenient to have a quick settings tile if you want to change it frequently.

Also of note is that the APK is < 20 KB in size, and there are no third party dependencies used in the app.

This repository started in this fork and was turned into a standalone repository since almost all of the code had been changed since being forked.