As a person with Celiac, there is always hidden gluten in the things that I eat, which can be detrimental to my health. This app is amazing!! When you check a product, it can easily and definitively tell you about the ingredients, whether its safe for you, and even whether cross contamination during processing of ingredients is a possible issue. This is the best allergen warning app i've tried and I've tried a few. It has an incredibly user-friendly interface which is easy to use, and only takes 4 questions to set up. This app is a total lifesaver for people like me who spend hours in the grocery store checking ingredients. The best part is that this app is free!!