A reader gave me a useful boundary for Nab: compare the groceries they buy every week, but stop before adding anything to a cart.

I m the maker, and I d like to use that as a small beta test rather than ask people to delegate a whole shopping trip. Here is the prompt:

Compare these five items across these two shops in [country]. Match pack sizes, show unit prices and source links, and state when you checked. Flag membership prices and unavailable items. Don t add anything to a cart or buy.

The result should make it easy to spot a wrong size, an expired offer, or a missing delivery fee. A cheap-looking total without those details isn t very useful.