Why this exists
Four and a half miles in the heat, and I left behind the one I needed.
Naples, middle of summer. My wife had wanted the Amalfi coast. The kids wanted another day by the pool. I wanted a mug.
Got there, bought the Naples one, and left the Italia sat next to it — stood there trying to picture our shelf at home and decided we already had it.
We didn't. So it is gone now, unless I pay three times the price online. After four and a half miles. And it is not the first time.
That is the actual problem. Not forgetting what is on the shelf — not being able to check while stood in the shop with the thing in my hand. Every app I tried wanted me sat at the kitchen table. Nobody built the one you need at the till.
So I built the one I wanted. It works with no signal, because that is where you need it.