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 at your supermarket, not a guess. Each dinner in your library is costed from the products its ingredients are linked to, and a dinner is marked when a core ingredient is on special or cheaper than you last paid: the chicken, not the stock. Every estimate says how many ingredients it could price, and a dinner with no prices yet shows no number at all.

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 the meal library points you at the dinners that are cheap this week.

Your checklist, meal plan, master list and this week's meal prices 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.