The courier service GroupMe is born for the need to manage instantaneous messages for groups of persons in particular, especially the chat the public enjoys good reputation in general. Nevertheless, it plays a fundamental role in the growth and Internet expansion. The applications of courier service GroupMe have taken big part of the market and have turned into a tool of work more and more used in personal, professional, social ambiences and into emergency situations. The mobile application under the name of the messaging FriendsChats GroupMe: Account with a service provided by Google called Firebase, which allows you to store the information in the cloud quickly and safely. In view of the fact that applications that offer the same service of communication have been developed with primitive tools such as the cloud storage (no security), for this reason it is advisable to implement Firebase, the same that provides read / write rules, avoiding new safety rules. The project was carried out in O.S. Android with the participation of two specialists: a functional development and another one of the interface. Implementing Firebase to Android, any information that is entered in the database is synchronized with different devices with the application.