This project describes the process of creating a cross-platform application, starting into an Android app and a web page designed to control food intolerances users. The system will control a full database of products, its composition and manage all user queries entering a EAN code (European Article Number) of a product or food. EAN is a 13-digit bar code symbology, which is a superset of the original UPC (Universal Product Code), and adopted by over 100 countries and nearly one million businesses and printed on all products that can be purchased at stores in our country. The application will acquire this code by mobile phone camera (Android version) or by directly entering (all versions). It will also allow the user to incorporate all intolerances into the system, warning us about the danger of consuming any product or component stored as harmful in the app. The aim is to create a separate 3-tier application where logic and storage of information are in unique and separate layers, detached of the presentation layer, since in our design we have two different fronts: on the one hand, a website and the other an Android app. This way, the effort required for implementation is substantially reduced, since it is only necessary to duplicate work in very specific parts, the both fronts. The final products are an Android app, a web page, a SaaS-based webservice that will manage both logic, a database system and a description of the most significant parts of the process.