Simple To-Do widget that syncs between phones

I have tried many widgets for a shopping/task list, but can't find one that fits my criteria. I would like it to: 1. Be SIMPLE - add and delete items right from the widget 2. Sync automatically between my wife's phone and mine 3. Not be date-based - I want to see ALL items until I complete them 4. Each item goes away when marked as complete Any suggestions? Wunderlist is very close, but only shows "todays tasks".