The Philippines experiences natural and man-made disasters, yet preparedness and response to disaster victims is still low due to fragmented communication, misinformation, and lack of a common platform for coordination. To address these gaps, the researchers developed KALINGA, a mobile disaster-response application that would help and provide citizens with timely access to relief distribution schedules, offline access to emergency hotlines, evacuation centers location, and shelter information. The application aims to improve the accessibility, transparency, and organization of disaster-related information and resources. The Agile Methodology was utilized for the study, which enabled iterative development and continuous refinement based on user feedback. The app was improved and evaluated through ISO 25010–based User Acceptance Testing involving fifty (50) citizens from different barangay within Bogo City, two (2) LGU representatives specifically from the CSWD, three (3) barangay level responders, three (3) city level responders, and one (1) IT expert. The UAT questionnaire included various software characteristics based on a 5-point Likert scale. Therefore, the results provided an overall weighted mean of 4.23, showing that KALINGA is functional, user-friendly, reliable, and it was able to effectively assist and coordinate communication and coordination during disasters. However, the study has found limitations such as network instability, varying levels of users’ technological knowledge, and the use of a token-based AI chatbot which would restrict access by all individuals in circumstances of actual disaster situations. Despite these limitations, the findings indicate that KALINGA can greatly contribute to the improved and efficient disaster response efforts and support communities more effectively.