The rise in emergency situations — accidents, crimes, and medical crises — has made personal safety a critical concern. Existing communication methods often fail under high stress, resulting in delayed responses and increased risk. This paper presents Raksha360, a cross-platform mobile application that enables users to dispatch real-time SOS alerts with live GPS coordinates to trusted contacts via a single tap. Built with Flutter and Firebase Firestore, the system integrates the Geolocator package for high-accuracy GPS acquisition and WhatsApp/SMS for multi-channel alert delivery. Evaluation across multiple devices and network conditions achieves sub-5-second alert delivery, ?5 m outdoor GPS accuracy, and 97% cloud write reliability, confirming the architecture\'s viability as a scalable, production-ready personal safety solution.