In this 4.0 industrial revolution, technology has many important roles in many aspects of life, such as in language education. If the students want mastering the four skills of English, the students have to master the English vocabulary. Unluckily, there are so many students who lack of vocabulary. It could be happened because the teacher used uninteresting media in teaching vocabulary. Now, the technology can solve that problem in order to help the students in mastering English vocabulary. One

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... of the technologies that can help in the students to enrich the vocabulary is Duolingo Application. This research aim is to investigating the students' of UIN Prof. K.H Saifuddin Zuhri Purwokerto perception toward the use of Duolingo application to enrich the students' vocabulary. This research is using quantitative method. The data were collected using questionnaire that distributed to 30 students at UIN Prof. K.H Saifuddin Zuhri Purwokerto. In collecting the data, the researchers used 10 question in questionnaire, which were used to collect the data. Based on the data, the results shows that most of the students have good perception towards Duolingo application and they believe that this application can enrich their English vocabulary. So, it can be one of the effective media to enrich the students' vocabulary mastery.