This study investigates the effectiveness of offline digital mathematics tools in improving learning outcomes for Junior High School students in rural Ghana, where internet access is often unreliable. Specifically, it explores the use of GeoGebra to enhance learners’ understanding of Geometry in contexts with intermittent connectivity. Geometry, one of the four strands in Ghana’s standards-based curriculum, requires strong spatial reasoning and measurement skills, which can be significantly strengthened through technology-supported instruction. Guided by a positivist paradigm, the study employed a quantitative, quasi-experimental design. A total of 326 students from three districts experiencing varying degrees of connectivity challenges were sampled. Ethical standards were upheld through anonymized data collection. Participants were randomly assigned to an intervention group or a control group. The intervention group used offline-enabled devices pre-loaded with GeoGebra and other mathematics resources, while the control group relied on traditional textbooks and teacher-led instruction. Over six weeks, both groups completed pre- and post-tests assessing mathematical proficiency, problem-solving ability, and conceptual understanding of Geometry. Statistical analyses, including paired t-tests and ANOVA, were used to compare performance. Findings showed significant improvement (p < 0.05) in the intervention group’s scores. Survey feedback and offline platform interaction data further indicated a strong positive correlation (r > 0.6) between access to offline digital tools and learning gains. The study concludes that offline digital resources such as GeoGebra can help mitigate educational barriers caused by poor internet connectivity. It recommends expanding offline digital integration in Ghanaian schools and encouraging mathematics teachers to incorporate these tools to support conceptual visualization. Future research should examine long-term effects and teacher-led implementation models.