Listalux

Listalux promises to make your grocery shopping trips quicker and easier with the following features:

• Share your list with other iOS users to enable real-time shopping list collaboration (requires Apple ID).
• Quickly add items to your list using the auto-complete feature.
• The app learns how frequently you purchase particular items, and generates "suggestions" for items to add to your list accordingly.
• In shopping mode, the items are displayed in sorted order according to category and sub-category. The ordering of categories and sub-categories can be customised in the app to suit the layout of your local grocery store.
• The database of items that can be added to your shopping list is fully customisable in the app.