The Expense Tracker is a user-friendly application designed to help individuals manage and monitor their personal finances. This paper provides a comprehensive theoretical exploration of the role of expense tracker applications in influencing the financial behavior of university students. Drawing on behavioral economics, cognitive psychology, technology acceptance models, and gamification literature, the study examines how these apps contribute to financial awareness, budgeting, saving, and reduced impulsive spending. The paper covers the significance of the study, literature review, problem statement, objectives, scope, app features, and theoretical frameworks. It also includes an analysis and interpretation of existing secondary data, an overview of gaps and trends, limitations, and a conclusion. The discussion emphasizes that while expense tracker apps provide accessible tools for students to manage finances, their effectiveness depends on user literacy, motivation, and app design. Recommendations are made for educators, developers, and policymakers.