Nowadays, when life is speeding up, and modern technology has made it possible to be available 24 hours a day via cell phones and tablets, we have almost no free time. Because of the increasing amount of daily duties and flexible working hours, it is important to know how to organize your time. A lot of time every day is spent on scheduling meetings, whether business or private, because you have to coordinate free time with other people, which is often difficult, especially in the case of a larger groups. Mobile application for scheduling meetings, which finds ideal meeting time for the group is one way of saving time. In this thesis wil be shown the process of designing an applications for scheduling meetings for Android operating system through several stages, following the guidelines of user-centered design. In order to achieve long-term customer satisfaction, it is necessary to constantly research their needs and improve your product. In this thesis will be conducted research and usability tests in order to find out which parts of the existing design needs to be improved and how. Then, some changes in the design will be made according to the results of research. Aim is to develop simple and interesting user interface that will be usable and that will help users to solve their problems.