This study aims to explain students’ voices about Grammarly application as an Online Grammar Checker to increase EFL Students’ mastery of simple past tense in writing recount text. This study used a qualitative method and a narrative inquiry research design. The technique of data collection is an interview. This research uses data reduction, data display, and drawing as the techniques of data analysis. The participants of this research are three English Education Department Students at the Education and Teacher Training Faculty of UIN Walisongo Semarang in the academic year 2022/2023. The result of this study shows that all participants thought that they found it helpful in mastering the simple past tense in writing recount text using the Grammarly application. Although they also have a little difficulty in using the application.