Try "Shopping Buddy":
Currently Android-only. I am trying to find time to finish an iOS version.
Main focus of Shopping Buddy:
- Simplicity. You won't find any complex database functions in this app. It is built to replace shared pieces of paper which is frequently misplaced.
- Syncs to the cloud. Multiple persons can share and update the same list. May be handy for a solo user with multiple devices.
- Supports attachment of photo to each item (which is also synced). This is useful for product identification, price verification, imaging a paper coupon etc.
- Supports Twitter-like hashtags for categorizing items. Familiar, flexible and lets you categorize an item under multiple categories.
- Price-free and ad-free, and will remain so, I promise