<![CDATA[Pregnant women need structured prenatal stimulation guidance to support fetal nervous system development. However, most existing pregnancy health applications only provide general information and lack personalized, scheduled, and activity-based prenatal stimulation guidance. This research is a Research and Development (R&D) study that aims to design a user interface and user experience (UI/UX) prototype of a mobile application called Stimy using the Double Diamond method, which consists of the Discover, Define, Develop, and Deliver phases. User requirements were collected through literature studies, interviews, observations, and questionnaires, then analyzed to produce wireframes, mockups, and a high-fidelity prototype using Figma. The prototype was evaluated through usability testing on the Maze platform using the System Usability Scale (SUS) questionnaire. The resulting prototype provides features including fetal development information, prenatal stimulation guidance, music recommendations, schedule reminders, activity tracking, and educational articles. Usability testing showed excellent results, with an effectiveness rate of 100%, an Overall Relative Efficiency (ORE) of 85.5%, a memorability rate of 100%, a MAUS score of 92, and a SUS score of 79.46, categorized as Good and Acceptable. These findings indicate that the Double Diamond method effectively supports the design of a usable UI/UX prototype that meets the needs of pregnant women and can serve as a foundation for future application development.]]>
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