diffy is an easy to use cloud based shared list.
Your list has a unique random key. You may add an item to the list and it will be stored in the list located in the cloud.
You can share your list-key with others, and you can the edit the list from different places and have always the same list.
Everyone who knows the list-key can access, edit and delete the list. The security is limited to the knowledge of the list-key.
Use-case: You have your shopping list saved in the diffy-cloud. While you are at the mall you refresh the list and get the latest version from the cloud. If someone at home has added a new item, you will see it after the list is refreshed. You will always know what to get.
Easy to use, always up to date, never forget to buy important stuff at the mall - diffy!