<![CDATA[The availability of interactive learning media determines the success of educational processes, especially in implementing the Merdeka Curriculum. This study was motivated by low learning interest (mean 53.9%) and IPAS learning outcomes (mean 68.5; below the KKTP of 75) among fourth-grade students at SD Negeri 1 Nglebo, Trenggalek, attributable to limited instructional media. This study developed the Android-based interactive learning application "KaLoT" (Keragaman Budaya memuat Kearifan Lokal Trenggalek), integrating national cultural diversity with Trenggalek local wisdom. The Research and Development (R&D) methodology with the ADDIE model was employed, involving 14 students (SD Negeri 2 Suruh) for small-group trials and 23 students (SD Negeri 1 Nglebo) for large-group trials. Data were collected via expert validation sheets, teacher response questionnaires, classroom observation sheets, learning interest questionnaires, and HOTS-based pre-test/post-test assessments, analyzed using quantitative descriptive analysis and N-Gain. Results demonstrated: (1) very high validity at 93.85%; (2) very high practicality averaging 93.46%; and (3) effective improvement of learning outcomes with N-Gain of 0.71 (small group), 0.75 (Class IVA), and 0.66 (Class IVB), with learning interest rising from 53.5–55.8% to 91.0–93.2%. The study concludes that "KaLoT" is valid, practical, and effective for IPAS learning in Grade IV elementary school.]]>
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