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For Android there are few fully free & open-source alternatives.

I use OpenNoteScanner.[0,1]

[0] https://github.com/ctodobom/OpenNoteScanner

[1] https://github.com/yeyeto2788/OpenNoteScannerPDF

MS OL works surprisingly well with OneDrive on my iPhone. I frequently use this pipeline on my desktop instead of using my USB printer/scanner.

I've also used OL on Windows 10 (desktop) to crop images of documents sent to me from others. The GUI assumes you're using the app on a tablet, but it's workable.

I don't like the recent update to OL which added a carousel of images from my iPhone's stored photos. I use OL exclusively for business, so the carousel showing personal photos is idiocy.

I have had good success with the document scanning built into iOS. For some reason it's buried within the Notes application.