As buildings become increasingly complex and aging infrastructures persist in modern cities, the risk of diverse disaster scenarios has grown significantly. To address the safety challenges associated with outdated building environments, we propose a mobile application-based disaster warning and evacuation system tailored for indoor use. The system is built on a custom-designed embedded platform, the Crisis Response Processor (CRP), which utilizes stacked Raspberry Pi boards and MEMS sensors to collect spatial data in real time. It automatically analyzes environmental parameters using predefined thresholds and provides users with disaster alerts and evacuation guidance through a connected mobile interface. Experimental results demonstrated high accuracy (precision 95.9%, recall 97.9%) and practical user responsiveness, confirming the system’s applicability for real-world indoor disaster management.