I use Sortly, an iOS app. It scans bar and QR codes, pictures can be added of items along with their storage
location (in case you forget what "stbd fwd rear locker" means). You can search by item name or location (i.e. what is in the stbd fwd rear locker?).
You can set both the number of like items (e.g. fuel
filters) and the minimum required inventory. Not sure what happens if the number drops below the minimum.
I have two boats and it keeps track of what stuff is on which boat
and its location - a task that my brain struggles with.
It is subscription based, works online and offline and user support is actually pretty good.
I started with the free version and used it until I hit the maximum number of items. It was working well enough that I bought a subscription, about 4 years ago. I have the "Plus" plan - unlimited entries, 8 custom fields and 1 user license
for C$61.99. More than one user costs more.
A simpler and free inventory app is "AnyList". It can be shared, can accommodate photos but as far as I can tell does not scan codes. Items and their location can be added using Siri or Alexa. We use it mostly for managing food
(shopping and inventory - but the latter not on the boat, we use Sortly for food
, particularly when canned and other long life storage
items are put into hard to access locations).
Good luck and let me know if you have any questions re these two apps that I have been less than clear about.