The Expense Tracker App is a cross-platform mobile application built using React Native, designed to help users securely manage their personal finances. It allows users to track income and expenses in real time, view spending analytics through an interactive dashboard, and gain better financial awareness. The application includes email-verified authentication powered by Clerk and a scalable backend built with Node.js and Express. Redis is used to optimize performance and improve data retrieval speed, ensuring a smooth and responsive user experience.