The basic idea of this master´s thesis is to present a detailed development process of a mobile application that would serve as an aid to patients (referring to those who come for examinations and tests) and visitors (who come to visit bedridden patients) of the Služba za plućne bolesti i TBC Klenovnik. As the name of the hospital or department suggests, it specializes in lung diseases and tuberculosis, especially testing for asthma, various allergies, and lung rehabilitation. More than 5 specialized wards have lying-in patients and they have visits every day after 14:00, and accordingly there is a large circulation of people during the day, from tests and examinations that are carried out in the morning, to visits, which are in the afternoon. The main problem is that people can't find their way around, they have a hard time finding test and examination locations, and visits have a hard time finding the rooms and departments where their closest ones are located. This is precisely why this paper will describe the development of the creation of a mobile application that would solve these problems, initially theoretically, what is needed to create such a mobile application, and later in the second, practical part, everything will be shown processed in the theoretical part, through an example interface of the mobile application created in the graphic tool Figma, with the aim of obtaining the best possible UI/UX (User Interface/User Experience). Also, a survey questionnaire will be conducted to check whether such a thing is even necessary and, if so, whether it would be used.