The shopping list your whole house shares
Everyone adds what you have run out of. Everyone sees it. When the shopping is done, what you bought moves into the cupboard on its own.
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One list, everybody
Add things from wherever you are. Whoever ends up at the shop has the whole list in their pocket.
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It remembers what you have
Tick things off as you shop. Close the list and it all lands in the cupboard, so nobody buys a fourth jar of mustard.
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Just say it
Hands covered in flour? Say “we’re out of eggs” and it goes on the list. It even works out that you meant the ones you always buy.
Free, and it works on the phone already in your pocket.