SISILIA NOVENA M. WUNGUBELEN Pengarang SEBASTIANUS FERNANDEZ Dosen Pembimbing 1 Zantty O. Padahana Dosen Pembimbing 2 Fransiskus Bustan Ketua Penguji

This study investigates the effectiveness of the Cake app as a Mobile Assisted Language Learning (MALL) tool in enhancing vocabulary achievement among ninth-grade students at SMP Negeri 3 Kupang. The research employed a quasi- experimental design with pre-test and post-test involving two groups: an experimental group using the cake app and a control group following conventional learning methods. Data were analyzed using SPSS 27, including normality tests, homogeneity tests, and a paired sample t-test. The findings showed a significant improvement in the experimental group, where the mean pre-test score increased from 53.73 to 83.07, while the control group improved from 51.77 to 76.40. The paired sample t-test resulted in a p-value (Sig. 2-tailed) of 0.001, indicating a statistically significant difference (p < 0.05). The results of the hypothesis based on the paired sample t-test showed that the Tobserve value was 15.709, which was higher than Ttable (2.0009). Additionally, the p-value (Sig. 2-tailed) was 0.001, which was lower than 0.05, indicating a statistically significant improvement in vocabulary skills. Therefore, Ho was rejected, and Ha was accepted, which confirms that the cake app significantly enhanced students’ vocabulary. The research concluded that the cake app was an effective and interactive tool for vocabulary learning, offering engaging features such as native speaker videos, pronunciation practice with AI feedback, and interactive quizzes. It was recommended for both teachers and students as an alternative method to enrich English language learning in a fun and accessible way. Keywords: Cake App, Mobile-Assisted Language Learning, Vocabulary Achievement, English Learning.