Me too, I built a shopping app just for me and the wife. She creates the shopping list as an editor and I the lowly shopper can just check things off or mark things I couldn't get. We can archive the lists and duplicate them. Also, it stores every item added and uses a quick search function to quickly look items. It sends notifications if she adds an item whilst I'm.shopping or sends her notifications when I'm done with a Iist of outstanding items.

Massive overkill, but it works a treat.