The community event starts in an hour. The extension cable exists, everyone agrees it exists, and nobody knows whose cupboard contains it.
A lightweight shared-kit tracker could help clubs or small event teams record equipment, responsibility and return dates. That is a testable idea, not evidence of a subscription business.
Map the handover
Observe how items move between people. Does somebody sign them out? Is there a group chat? Who notices when something is missing? The useful record may be a simple last-confirmed holder rather than a full warehouse system.
Choose one audience with recurring events. A once-a-year gathering may not create enough repeated value to support your intended pricing.
Make participation easy
Prototype adding an item, assigning a holder and confirming a return. Test with an invited participant who has never used the app. Avoid making the organizer perform all the updates; that can recreate the original burden in a new interface.
Use reminders sparingly and make recipients aware of what they are receiving. A coordination tool should not become an unsolicited-message generator.
Test the awkward states
Items can be split across bags, damaged, lent outside the group or marked returned by mistake. The product needs understandable correction and history proportional to the task.
Do not overbuild procurement, depreciation and accounting before proving that people will maintain the basic handover record.
A pilot can cover several actual events with a small set of items. Measure whether the kit is found and returned with less organizer effort. A beautifully populated inventory on day one is not enough.
The commercial question is whether the avoided confusion is frequent and costly enough for a buyer to pay. The product question is simpler: when somebody asks where the cable is, can the app give a trustworthy answer?