There are many applications used in learning English. One of the applications of technologies that popular is Duolingo. Duolingo is a great example of straightforward language application. Duolingo can help learners to improve their speaking skill in communication. By using Duolingo application as an effective media to improve the students’ speaking skills. The objective of this study was to get an empirical evidence of the effectiveness of using Duolingo application to improve students’ speaking skill. The method of this study was quasi-experimental study. The population of this study was the tenth grade of Madrasah Aliyah Bilingual Batu. The samples are consists of 20 students from X IPS 2 as the experimental class and 20 students from X IPS 1 as the controlled class. The experimental class was taught by using Duolingo application and controlled class was taught without using Duolingo application. The research instruments were questions and answers tests for pre-test and posttest, and rubric for speaking. The data of this study was analyzed by using t-test. Based on the statistical calculation with the significance level 5%, it showed that to = 2.881 is higher than tt = 1.672. The result of the study was indicated that the use of Duolingo application can give a positive effect to improve students’ speaking skill at the tenth grade students in MA Bilingual Batu school year 2019/2020. Therefore, it can be concluded that using of Duolingo application as a media technology may implemented in the school