Household shopping usually goes wrong in a small, familiar way: two people buy milk, nobody buys bread, and the list everyone agreed on lives in one person's head or a group chat that has scrolled away. A shared list fixes the obvious part. The less obvious part is that people in the same house often eat differently (one vegetarian, one with a nut allergy, a kid who'd live on pasta) and a plain shared note knows none of that.
Here each person keeps their own Grocery Planner, and the Household view pulls everyone's weekly lists into one, merged by item ("Milk · Anna, Luca") so nothing gets bought twice. Whoever does the shop ticks items off for everyone, and each tick shows on the other lists with the name of who bought it. Or one person builds the week's list for the whole household: pick who's eating, children without an account included, and the list combines everyone's allergies, follows the strictest diet in the group and sizes amounts from each person's targets. To be straight about the tiers: whoever creates the household needs a Premium plan and everyone else needs Basic or higher; the planner on its own is free. Start with the free planner below and see what a week's list looks like.