The use of applications in learning occasionally needs to be applied in modern education. Research on learning applications also needs to be conducted to ensure the achievement of learning targets by learning using an application. This study aims to explore students' perception of using TOEFL AIO apps in vocabulary and pronunciation class together with their learning strategies. This study has conducted with a qualitative approach. Ten participants randomly selected from the students who took vocabulary and pronunciation class from batch 2020 unit 2 in the English Language Department of UIN Ar-Raniry. Semi-structured interviews were used as the instrument to answer research questions. From the result of the research, it was found that there are six categories of students' perceptions and five learning strategies. All those perceptions of students, fortunately, showed positive results.