No. The extension fills the trolley and stops. You review it and check out yourself, every time. It never sees a card number.

Once it knows your household, yes: about five minutes ticking round the house, two minutes picking dinners, and roughly five watching TrolleyFill load a 64-item trolley. Setup is the part that takes longer: budget about ten minutes at the start for Restock to read your supermarket order history and for you to check the products it matched.

From real shelf prices, not a guess. It costs the items on your actual list at each store you've told it you shop, adds the pickup fees, and compares. It only counts items it has a recent price for at both stores, and it prints that number on screen, because a store shouldn't win just by knowing less. It needs a second store set up, which Restock offers after your first shop.

One real Dunedin household went from $516/week to $455/week over six months on the same food. That's about $61 a week, mostly from trips that stopped happening rather than discounts. Your bill and habits are different, so your number will be too. The mechanism is what carries across: a complete list means fewer trips, fewer trips means fewer impulse bags, and ShopOptimiser puts each shop at the cheaper of your stores.

Your checklist, meal plan, master list and ShopOptimiser comparison all keep working, free, forever, including In Store Mode, so you can still walk the aisles and tick the list off as you go. You just go back to doing the clicking online.