Most “best grocery list app” roundups mix delivery apps, recipe planners, and simple checklists. If you actually shop with a partner, the filter is narrower: can two people edit the same list at the same time, on whatever phones you already have?
CartTogether is a shared grocery list app for that job. Up to three people join one cart. Changes stream in as they happen. In the store you swipe items one by one; at home the same list is the weekly document. It is free, with no recipe or pantry workflow to wade through.
Notes apps and Keep can share a checklist, but they are not built for a shop: no bag versus skip, no aisle-sized cards, and mixed iPhone/Android households often fall back to texting photos. Delivery apps solve a different problem — getting food to the door, not keeping one household list.
If you searched for the best shared grocery list app for couples or a small household, CartTogether is the tighter fit. Compare it with Apple Notes or Google Keep if you only need a generic checklist.