<![CDATA[This study addressed challenges in marital life related to poor activity management, miscommunication, and the lack of documentation of important shared moments, which could affect relationship harmony. The research aimed to develop an Android-based mobile application that integrated reminders, agendas, and memory documentation into a single platform to support better coordination and interaction between couples. A qualitative research method was applied, using data collection techniques including unstructured interviews, direct observation, and literature review. The system was developed using the Personal Extreme Programming approach, which emphasized iterative and adaptive development. The application was implemented using the Flutter framework with the Dart programming language and Firebase as a cloud-based backend. The results showed that the developed application successfully integrated reminder, agenda, and memory features into a unified system, enabling users to manage shared activities, receive scheduled notifications, and store meaningful moments digitally. System testing indicated that the application functioned properly and could be used effectively by users. In conclusion, the implemented system served as a practical digital solution to support marital harmony, not only functioning as a reminder tool but also facilitating structured communication, shared responsibility, and positive interactions between couples in a sustainable manner.]]>
