Create multiple grocery lists, share them via email, or if you want real-time collaboration you can share it in iCloud. Ideal for families to do their grocery shopping or group of friends that want to do some shopping for some party. You can also keep a budget list and see how you did.
I did this app for me. I do not like In-app purchases, and I do not like when people share my data, so this app does not do anything of those.