LifeSaver: A Cross-Platform Mobile Application for Real-Time Blood Donor–Recipient Coordination, Emergency Request Management, and Donation Awareness

The acute and persistent shortage of blood units during medical emergencies remains a major public-health challenge in India and other developing nations. Conventional methods of locating compatible donors — phone-trees, social-media broadcasts, and walk-ins at blood banks — are slow, fragmented, and frequently fail at the moment a patient most needs help. This paper presents LifeSaver, a cross-platform mobile application designed to bridge the gap between voluntary blood donors and patients/families requiring urgent blood by providing a single, location-aware digital platform. The application supports two distinct user roles — Blood Donor and Patient/Family — and exposes role-specific dashboards, an emergency request board, a donor-availability registry, an integrated donation tracker, and a comprehensive awareness module covering benefits, frequently asked questions, and common myths. The system uses a real-time cloud database for instantaneous propagation of emergency requests, integrates the device's native dialer for one-tap voice contact, and tracks donation history to compute eligibility for the next donation cycle. The implemented prototype demonstrates a complete end-to-end workflow — registration, emergency-request creation, donor matching by blood group, and donor response — within a sub-five-minute test scenario, validating the feasibility of mobile-first solutions in saving lives during blood-related medical emergencies.