The subject of research in this specialist final thesis is the implementation of the "Smart City" project in the city of Zaprešić in the form of a pilot study. Smart cities are ubiquitous in the world today. These are cities that use smart service systems that make processes in the entire city easier, faster and simpler and improve the lives of their citizens. The goal of introducing smart cities is to improve the quality of life of people living in smart cities, and this can only be achieved if the smart city concept is carefully planned, successfully implemented, and continued to be upgraded after implementation. Some of the cities that widely apply the concept of smart cities in the world are Singapore, London and New York, and in the Republic of Croatia they are Rijeka, Zagreb and Rovinj. In the practical part of this thesis is presented the ZapApp project which is intended for the City of Zaprešić. After a detailed analysis of the current situation in the City of Zaprešić, a project was developed, namely the ZapApp application, through which several problems that have been observed can be solved by means of new, digital technologies, and with which the life of the citizens of the City of Zaprešić can be greatly improved. From everything stated in the paper, it can be concluded that the concept of smart cities is widely accepted and is applied by many cities around the world. Considering the advantages that smart cities have for their citizens, it is assumed that the concept of smart cities will be applied even more often in the future and that thanks to the smart solutions that cities regularly implement in their daily business processes, citizens will have an even better and better standard of living in the future.