Aim: The purpose of this study was to evaluate the effect of a comprehensive mobile application program in managing behavior and psychological symptoms of home‐dwelling patients with dementia in South Korea. Methods: A nonequivalent control group pretest‐posttest design was conducted. A total of 26 family caregivers participated in this study. The application program consists of understanding of dementia, interventions, communication skills, coping methods, and bulletin boards. Data collection was performed from July 9, 2018, to October 4, 2018.