Wife and I used to use Cozi, but now we use Copy Me That. We are able to find recipes online and add them to the app. You create a meal plan by pinning the recipe to the day you are going to prepare it. It will then create shopping lists that you can sort by meal or by product type (and toggle back and forth). When it is time to cook, you pull up the app, click on the meal and it will go directly to the website the recipe came from and give you step by step instructions. You can also easily add items to your shopping list that aren't a part of any recipes (toiletries, pantry staples, etc).
We share an account so either of us can log into it at any time and add/modify. Oh, and it's free.