15 is more crowded than you have allowed for and I say that as someone who shipped one.
Receipts specifically are done. The photo libraries do it, the accounting tools do it, and the accuracy bar is set by something with far more training data than you will have. I lasted about nine months.
The part nobody has done well is the boring end of your own list, meter readings and serial numbers. Not because it is hard, but because it is unglamorous enough that the platforms have not bothered. A serial-number history for everything you own, pulled out of photos you already took, is a genuinely useful thing that no big product wants to build. That is a much better shape than "librarian for your camera roll", which is a category, not a product.