Why it exists
It started with a tool I didn't need to buy.
I had a job on that weekend, so I bought the thing the job needed. Used it for an afternoon. Mentioned it to a neighbour a few days later and got the reply everyone eventually gets: if I'd known you wanted that, I've got one you could have borrowed.
So now there are two on the street. Mine will come out again in about four years.
That conversation happens everywhere. It stings a bit more here, because here is an island. A trip to the store isn't twenty minutes — it's a crossing, a timetable, and most of a day. The tool you didn't know your neighbour owned is the tool that costs you a Saturday.
And there's the plain satisfaction of a thing being used properly. A ladder that gets climbed a hundred times instead of twice. Nothing bought that didn't need buying, nothing sitting idle in a shed while someone three doors down goes looking for one.
None of that needs an app, really. It needs everyone to know what's already on the street. That's all this is.