Time is very important in the world of technology. Online education can make dead time usable for us. It is unnecessary to spend a lot of time in traffic to reach an educational center or to give up learning it because of the lack of special education in our city and place of residence. Mobile applications allow us to enjoy learning our favorite subject at any time and in any place. This research examines the design of an application user interface. The research is descriptive and analytical through library resources. At first, it reviewed the design of user interface. It discussed the importance of mobile learning and its definition, the application and its history. Then a variety of user interface design styles and languages were proposed for the application. Various types of applications were examined, including their use, and variety of educational applications. It finished with assessing the user interface and user experience of one of the world's most popular applications.
