Abstract: Learning Arabic has been an issue in the world especially in Indonesia which has the most Muslim population in the world. It has been stated that only 0.5% Muslim in Indonesia can read Al-Qur’an. The researcher proposed a solution with a new method of Arabic learning by implementing a mobile-based learning application so people can be taught easily, anywhere and anytime. Therefore, the researcher decided to study this problem. The focus of this study is to discuss the design of Arabic lessons using mobile application especially in context learning. This research was qualitative. The researcher was evaluating the application by using the usability testing technique. The findings suggest that Arabic learning materials of vocabulary can be improved by applying the theory of second language acquisition. The researcher also found that Arabic learning materials of grammar with the behaviorist and innatist methods are not enough. In addition, the user interface and user experience aspects should be considered to improve learner easiness.