Abstract. The primary goal of this study is to evaluate the customized mobile application comprised of learning objects (LOs). The mobile app evaluated was personally developed by the researcher to serve as supplemental material for learning grammar (i.e., the active and passive voice) with the aim of improving the learners’ grammar competence. The study employed the descriptive-evaluative research design focusing on the perspectives of the students on the mobile application through the “Learning Object Evaluation Scale for Students (LOES-S)” in terms of three constructs: (1) learning, (2) quality, and (3) engagement. Significant findings of the study included how beneficial and valuable the mobile application was to the learners in terms of “learning” with WM = 4.55, (2) “quality” with WM = 4.56, and (3) “engagement” with WM = 4.68. The study developed mobile application for learning grammar (i.e., the active and passive voice) was proven effective based on the evaluation of the students. Hence, recommended for wide dissemination.

Keywords: Learning Objects, Grammar Learning, Mobile Learning