CITIZEN APP is an all-encompassing COVID-19 Outbreak Management System aimed at helping governments mitigate virus transmission. Its main features include tracking virus spread and enforcing quarantine measures, real-time contact tracing at different geographic scales, and social distancing alerts that inform users about potential infection risks nearby. The app also optimizes queue management for testing sites and organizations, allowing for effective appointment scheduling. Furthermore, it supports real-time surveys to gather data for government decision-making and features an in-app marketplace for trading medical supplies and other products. The app focuses on various health areas, including communicable diseases and health promotion.