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This study aims to determine the effectiveness of the use of the artificial intelligence-based application (AI-Based Application) Duolingo in improving vocabulary mastery of EFL (English as a Foreign Language) students in Indonesia. This study used a descriptive quantitative approach with a single-group pre-test and post-test design involving 20 students of class VII C of SMP Negeri 1 Mappakasunggu. Data were collected through vocabulary tests, questionnaires, and classroom observations. The results showed a significant increase in students' vocabulary mastery, marked by an increase in the average score from 61 (fair category) in the pre-test to 78 (good category) in the post-test. Most students gave a positive perception of the use of Duolingo, especially regarding the gamification features, instant feedback, and simple and attractive display, which can increase motivation and learning engagement. The results of the observation also showed that students were more active and enthusiastic in using this application compared to traditional learning methods. Thus, Duolingo can be said to be effective as an AI-based learning medium to improve vocabulary mastery of junior high school students in Indonesia.  

This study examined the role of mobile-based language learning applications, particularly Duolingo, in supporting self-directed English language learning. Using a qualitative approach through literature review, this research analyzed various academic studies published between 2018 and 2024 that focused on the effectiveness of Duolingo in improving vocabulary, grammar, and learning motivation. The results indicated that Duolingo helped learners develop consistent study habits and fostered autonomy through its gamified features. In addition, the app offered a flexible and engaging learning environment. However, limitations were found in speaking skill development and social interaction, which the application did not fully support. Overall, Duolingo serves as a useful supplementary tool in learning English, but it should be combined with other methods for more comprehensive outcomes.

This research was motivated by the lack of students' interest in English lessons, especially in writing descriptive texts. The purpose of this research was to determine the extent to which the use of the Wattpad application could influence students' ability to write descriptive texts. This research was conducted at MA Miftahul Ulum Tanjungpinang in the first-grades students in the second semester of the academic year 2022-2023. This research was a quantitative study using an experimental method. The sample of this research was 50 students. The research method used was a true experiment with a post-test only control design. The result of the research, there is a significant difference between the writing scores of the experimental class and the control class where the post-test scores of the experimental class are higher. It can be seen that the mean value of the control class is 62,12 while the experimental class is 75,64. Thus, it can be concluded that there is a significant effect of using the Wattpad application on the ability of the first-grade students at MA Miftahul Ulum Tanjungpinang to write descriptive texts. based on student’s feedback using Wattpad application, the results show a strong positive trend across all questions related to Wattpad. Respondents tend to strongly support the statements provided. Mostly showed a positive “Strongly Agree” toward each statement, with only a few being neutral, disagreeing, or strongly disagreeing suggesting that the students had a favorable perception to the Implementation of the Duolingo application on the writing skill of the eleventh-grade students at MA Miftahul Ulum Tanjungpinang.

Most students in junior high school, especially seventh grade, had difficulty learning vocabulary. Even though vocabulary was very important for language learning. Duolingo could help with this problem because Duolingo could make students more interested and less bored when studying. The purpose of this research was to find out whether there was an effect of the Duolingo Application in increasing the vocabulary mastery of 7th grade students at SMPN 32 Bandar Lampung in the 2023/2024 academic year. This research methodology used in this research was quasi-experimental design. The population of this research was all 7th grade students of SMP Negeri 32 Bandar Lampung for the 2023/2024 academic year with a total of 180 students. This research sample consisted of two classes, namely class 7B with a total of 34 students as the experimental class, and class 7C with a total of 33 students as the control class. This meant that the total number of samples for this research was 67. The experimental class used Duolingo Application, while the control class used the “When English Rings a Bell” textbook and dictionaries. The sample for this research was determined using a cluster random sampling technique. The treatment was carried out in first meeting. In collecting data, this research used a test instrument in the form of 40 multiple choice questions. Before giving treatment, a pretest was carried out. Then, after the treatment has been carried out, a post test was given. The results showed that there is a significant difference in student scores before and after treatment. This research used hypothesis testing, especially the T-test, to find out whether the Duolingo Application had a significant effect on students' vocabulary scores. And the results show that Sig. (ρvalue) = 0.000 < α = 0.05. So Ha is accepted and Ho is rejected. It can be concluded that there is a significant effect of using the Duolingo Application on increasing the vocabulary mastery of 7th grade students at SMP Negeri 32 Bandar Lampung in the 2023/2024 academic year.

This qualitative study investigates the effectiveness of the Duolingo English app in enhancing English learning motivation among 11th-grade students at SMK Negeri 1 Sawan. Motivation in language learning is a critical factor influencing proficiency and engagement. Utilizing semi-structured interviews and participant observation, this research explores how the app influences students' intrinsic and extrinsic motivation levels. Findings reveal that DuoLingo positively impacts motivation through its interactive features and gamified learning approach, fostering a more engaging and enjoyable learning environment. Educational implications and recommendations for integrating such technology into language classrooms are discussed.

This qualitative study investigates the effectiveness of the Duolingo English app in enhancing English learning motivation among 11th-grade students at SMK Negeri 1 Sawan. Motivation in language learning is a critical factor influencing proficiency and engagement. Utilizing semi-structured interviews and participant observation, this research explores how the app influences students' intrinsic and extrinsic motivation levels. Findings reveal that DuoLingo positively impacts motivation through its interactive features and gamified learning approach, fostering a more engaging and enjoyable learning environment. Educational implications and recommendations for integrating such technology into language classrooms are discussed.

Improving Students’ Writing Ability In The Procedure Text Using Duolingo Application At 8 Grade Students Of SMP Negeri 5 Pati. Final Project, English Study Program, Faculty of Language and Arts Education, Universitas PGRI Semarang. Supervisor I Dra. Maria Yosephin, M.Pd, Supervisor II: Dra. Siti Lestari, M.Pd. This study aims to 1) to find out the improvement of students’ writing competence in procedure text before they are taught using the Duolingo application. 2) to find out the improvement of students’ writing competence in procedure text skills after they are taught using the Duolingo application. 3) to explain the significant difference in students’ writing competence in procedure text taught before and after using Duolingo application. In this study, the researcher used quantitative research. An experimental design was applied in carrying out this study.  The researcher took two classes as samples: VIII A (experimental group) and VIII B (control group). The experimental group has been given treatment by duolingo application in procedure text. On the other hand, the control group was not assigned treatment at all. The population in this study was class VIII in the  academic year 2023/2024. This study indicated that using Duolingo Application in procedure text is an effective technique. The results of the pre-test mean scores in both classes were 66.34 for the experimental group and 66.94 for the control group. In addition, the mean post-test score of experimental group was 84.78, and the control group was 76.66. These findings were calculated using the t-test formula. The t-test > t-table, based on the test results. T-table 5% percentage is 1.670. the computation shows that 6.180 > 1.670. There is a significant difference in students using  the Duolingo application in procedure text for students of grade 8 of SMP Negeri 5 Pati. Students are interested and excited when using Duolingo Application in the learning and teaching process with the goal of developing students’ writing skills. Based on the research findings, the researcher concludes that using Duolingo Application in procedure text can help students to develop and improve students writing skills.