Duolingo is one of the few technologically advanced tools being explored for its potential to enhance English teaching and learning. Its purpose is considered to be the next frontier, making it a digital platform equipped with learning concepts while playing. It is also accessible not only on the Internet, but also by using Android, iOS, and Windows Phone versions where students can study at their own speed. They may customise their learning style accordingly, which thus will then encourage effective learning with greater results in the teaching and learning of English as a second language. Nevertheless, it is not a simple undertaking. This concept paper investigated the potential and challenges of using a Duolingo app as a tool for teaching English. This paper provides a conceptual framework that can be useful for measuring the current level of reading comprehension mastery among Year Six pupils in Selangor. In addition, it examines students' perceptions of using Duolingo in improving their reading comprehension skills. The proposed research suggests using a mixed-method design which involves a pre-and post-test procedure with a test sheet as the research instrument and questionnaires to collect data. The proposed sampling will consider the sample selected to accurately represent the population and represent all relevant variables to avoid bias. The collected data is then expected to be analysed using inferential statistics. This research is anticipated to act as a catalyst in inspiring ESL teachers about the effectiveness of Duolingo as an additional material in maximising the benefits of language acquisition.