The integration of technology in entrepreneurship arithmetic that uses realistic mathematic education as the basis into learning processes is instrumental in creating understanding and problem-solving abilities among students. However, until recently only a few technology-based learning media have been developed to accommodate the aforementioned purposes. The objective of this research is to design, develop, and evaluate the effectiveness of a Solar2D-based learning medium in the effort of enhancing students' comprehension about entrepreneurship arithmetic. This research and development study uses ADDIE (Analysis, Design, Development, Implementation and Evaluation). The learning medium was designed and developed using the Solar2D application. The compiled data consists of the results of the media need analysis, validation test by media and content experts, effectiveness test through t-test and student responses after the learning processes were conducted. This study produces valid, practical, and effective Realistic Mathematics Education-Based Learning Media Using Solar2D Applications for Entrepreneurship Arithmetic. Its validity is on the category of highly eligible, while the practicality, which was measured from the students' responses, is excellent. The results of the pretest and post-test indicate significant mean differences with the N-Gain value of 0.77, suggesting the application's high effectiveness. The presence of this learning media emphasizes the potentials of technology for transforming education and fostering essential life skills.