How I've started to use OpenPrintTags for filament management
I attach these iCode SLIX2 Sticker Label which are 25mm in diameter to the outside of my dry boxes. For iOS (don't know about Android) I first use NFC Tools to format the tag and then NFC.Cool to generate the OpenPrintTag record for 3rd party spools and then save it to the tag. For Prusa Spools, I use the Prusa App to scan the QR Code and then I write the record to the tag using the Prusa App. Then I read it back using NFC.Cool so I can edit the container weight (to change it from just the spool weight to the box weight plus spool). When generating a record I use the dry box and spool weight for the "container weight" and the container and spool weight plus the filament weight (for a new spool) as the "nominal weight". I then weigh the filament in the box to get the remaining amount of filament.
So far this is still in it's infancy. If I have time (which I don't really) I would think about designing an app that allows me to scan my filaments into a database that can be exported to a spreadsheet.
NFC Tag and importing into Prusa App