An invoice scanning app is often evaluated as a cheaper scanner and is more useful as a way of capturing documents where they actually arrive. In many organisations that is a site, a van or a reception desk rather than the finance office, and the days lost between arrival and finance seeing the document are the real cost the app removes.
Capture where the document lands
A delivery note signed at a site, an invoice handed over at reception, a receipt from a merchant. Photographed at the point of arrival, it enters the queue that day with a real received date. Sent by internal post to finance, it enters days later and payment terms have already been running against a date nobody recorded.
Image quality is the constraint
Photographs are the hardest input for extraction: angles, shadows, creases and low light all degrade it. An app that checks the image at the point of capture and asks for another attempt is worth considerably more than one that accepts anything and fails silently downstream. Test that behaviour specifically.
What else to capture at the same time
Which order it relates to, if the person knows, and a photograph of any handwritten annotation on the delivery note. Short deliveries and substitutions are usually noted by hand at the door and lost thereafter, and capturing them at that moment is the cheapest way to make a later credit note argument winnable.
Questions people ask about invoice scanning app
Is a phone camera good enough?
For a text-layer document photographed carefully, usually yes. For a creased thermal receipt in poor light, expect review.
Should site staff use it?
Yes, if it takes seconds and needs no training. That is a product selection criterion rather than a training problem.
What about offline?
Test it. Sites and basements are common dead spots, and a capture that cannot be made there will not be made at all.