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Like I said in another comment: https://github.com/LibreShift/red-moon with a more complicated pattern than just a single color may be all you need for many use cases.

I don't think Android has an easy to use global shader system, so you'll be stuck with overlay windows and the incompatibility they have with banking apps/DRM crapware that locks you out of your own screen without root access.

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What do you mean by incompatibility with banking apps? I am also interested in what it would take to do a global shader on Android.

Android malware has previously used overlays to hijack taps and do other shady stuff.

Banking apps generally set a flag on their apps to prevent overlays and screenshots to prevent malware from reading the screen and tricking the user.

Depending on your phone, this can have two effects: either the overlay is disabled automatically or the banking app detects the overlay and blocks access (ie to the PIN keypad).

Not all banking apps do this, but the ones I've used do.

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