... A review of literature on the effectiveness of Duolingo revealed trends of research, investigated languages, and methodologies adopted in the field. In addition to critical review of the app from a pedagogical perspective in some studies (Bajorek, 2017;Cunningham, 2015;Munday, 2017;Teske, 2017), researchers focused on a series of topics including learner experiences (e.g., García Botero et al., 2018;Finardi et al., 2016;Lotherington, 2018), learning outcomes (e.g., Isbell et al., 2017;Jiang et al., 2024;Loewen et al., 2019), continuance intention of learners' usage (Ünal & Güngör, 2021), learner engagement as part of the class (Brick & Cervi-Wilson, 2019;Munday, 2016), the impact of winning streak feature in the app (Huynh & Iida, 2017), and academic success and academic self-efficiency (Rachels & Rockinson-Szapkiw, 2018). While some researchers investigated the potential of the app in learning of multiple languages (e.g., García Botero et al., 2018), most of them exclusively focused on a single language such as Spanish (e.g., Rachels & Rockinson-Szapkiw, 2018), English (Ünal & Güngör, 2021), French (García Botero et al., 2019), Turkish (Isbell et al., 2017;Loewen et al., 2019), and Italian (Lotherington, 2018). ...