I've used OpenNoteScan before:

* https://f-droid.org/en/packages/com.todobom.opennotescanner/

* https://github.com/allgood/OpenNoteScanner

It works OK but it looks a bit old, and you need to install OpenCV Manager separately, outside of F-Droid for it to work.

I can deal with it, but there's no way I could ever be able to convince anybody else, especially non-tech people to use it.

This one looks like a winner in terms of UX, so I'll be using it from now on, Thank you for creating it!