Catsup is a compact grocery list built for people who buy many of the same staples each week. Instead of retyping milk or eggs every trip, users keep a reusable list and toggle items off when bought, then back on when they are needed again. Items can be renamed and reordered, and up to three lists can be maintained. iCloud sharing lets other household members use the same list. The US App Store lists Catsup as a paid $3.99 download, with no in-app purchases shown. The app is currently iPhone-only and requires iOS 18 or later. It focuses on quick household shopping lists rather than recipe planning, inventory forecasting, or a large multi-list system.
