Wren lets a household share shopping lists across iPhone, iPad, and a web app. Changes sync so people can add items at home and see updates while shopping. Someone already at a store can open a shared link in a browser and check off items without installing the app or creating an account. The same item can appear on multiple lists and checks off everywhere when purchased. Notes and quantities help clarify what to buy, and lists continue working offline after they have loaded. The developer says an account is needed to create and manage lists and that Wren has no ads or tracking.
