The study used a mixed-methods approach involving both qualitative and quantitative methods. Firstly, we conducted a needs assessment and user research to identify the requirements and functionalities of the app. The data were collected through surveys, interviews, and focus group discussions with the volunteers who participated in the Kerala rescue mission. Secondly, the research team designed and developed a mobile app that could assist in inventory management, resource availability, and allocation. Finally, the app was evaluated through a usability test and a field test during a mock disaster scenario. The usability test involved 10 participants who were asked to perform tasks related to inventory management and resource allocation using the app.