With "My wishlist" you can easily create wishlists that you share with friends and family. Use the sharing code to share your wish lists and give others a full overview of what you want.
By retrieving and adding other people's wish lists, you will also be able to see what has been reserved before and what has not. With the app, you can reserve wishes in the wish list without the person who made the list wanting to see what has been bought. Go to the list and press "Reserve". Then others who have added to the wish list will see that the wish has been reserved, and you avoid getting double up with the same gift.