(Not sure where to put this: FAQ seems right).
OpenNoteScanner is also available for Android - it’s open source (I’m not connected with it).
It is available via F-Droid, Amazon and Google Play (I use F-Droid myself). Works well, and you
Read-Me file (help file)
Once you’ve scanned you can email, Bluetooth, text and so on via the usual suspects in Android - I just tried it out with a receipt and it works fine via email (using K9 Mail).