Google Keep works well for quick notes and simple checklists. Many households try to run groceries in Keep because it syncs and is free. The friction shows up mid-shop: long scrolling lists, no bagged vs skipped states, and a notes mindset instead of a cart.
CartTogether is a shared grocery list app, not a general notes tool. When your partner adds dish soap from the couch, you see it in the parking lot. When you bag croissants, they see the item done before checkout. That live cart share is the product — not an afterthought checklist inside a notes app.
If your Keep list is mostly groceries and you keep texting “did you get milk?”, CartTogether is the tighter fit. Keep remains useful for recipes, ideas, and non-shopping notes.
CartTogether is not the same as unrelated “Cart Together” apps on store listings. Try CartTogether when you want one collaborative cart on iPhone and Android.