The rapid development of information - communication technologies has resulted in a greater use of mobile devices and smart phones and portable computers. The main research question of this study is the extent to which mobile applications are significant to the Croatian and international tourism. It describes some of the most popular applications and there is presented statistics use of mobile applications in tourism just to prove their importance. The goal of the research is to specify the manner of application, role, advantages and disadvantages of mobile applications and analyze statistics related to their implementation. The research results show that today, mobile applications are very important for the tourism industry for the Croatian and the world level. Not only do they facilitate travel planning for passengers, but also facilitate the process of advertising and reservations for bidders and renters. At the global level, there is various kinds of tourist applications, as well as on the Croatian, but research shows room for improvement regarding expansion and improvement of the offer.