This bachelor thesis deals with UX optimization of a selected web application which is provided by guesthouse Penzion U Zvonu. Its goal is to optimize UX of web application. The bachelor thesis consists of two main parts. The first part is the theoretical part. It begins by defining basic concepts related to user experience. The following part is a summary of the history, creation and trends of web applications. The theoretical part ends with an introduction to the procedure and methods used in creating or optimizing a UX of web application. The second main part is the practical part, in which is used the procedure and methods described at the end of the theoretical part. The whole procedure is described and explained. The aim of the practi...