A mobile application called Ruang Guru is one of the well-known E-learning applications in Indonesia which has the highest number of downloads; however, the large branding turns out to be inversely proportional to the quality or usability level provided. This study aims to find problems in the application of Ruang Guru which deeply interfere with the usability level by the experts. The method used was Heuristic Evaluation with the principle of E-learning, this heuristic method specifically used to evaluate E-learning, because in this method the principles used were 15 principles that include instructional content of learning. Based on the results of the study, 28 problems were found in 10 of the 15 heuristic principles of E-learning. 3 heuristic principles had the most number of problems with 5 problems, namely H1 (Visibility of System Status), H4 (Consistency and Standards), and H7 (Aesthetic). And the heuristic with the highest average severity rating is H5 (Error prevention). From the problems found, this study provided 28 recommendations for improvement. These improvement recommendations were divided into 3 types of improvements namely user interface design improvements, system and security improvements, and user training.
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