Out of Milk is described as 'Have you ever returned from grocery shopping and realized you forgot that one item you really needed? Then Out of Milk is the perfect app for you: your Shopping List stays with you everywhere, the Pantry List allows you to keep track of your essentials so that you always know' and is a Grocery List app in the home & family category. There are more than 50 alternatives to Out of Milk for a variety of platforms, including Android, iPhone, Web-based, iPad and Android Tablet apps. The best Out of Milk alternative is Grocy, which is both free and Open Source. Other great apps like Out of Milk are Listonic, Bring!, AnyList and Groceed.
I like Bring! as an alternative to out of milk because it has all the functionalities it needs and easy to handle.