CitySentinel is an advanced geospatial intelligence platform that combines satellite imagery analysis with machine learning to provide city planners and urban developers with actionable insights. The application processes multi-spectral satellite data through Google Earth Engine to track urban expansion, green cover changes, infrastructure development, and environmental metrics over time. YOLOv8 models are deployed for real-time object detection to identify buildings, vehicles, and urban features from aerial imagery. The React-based dashboard provides interactive maps, time-lapse visualizations, and predictive analytics for urban growth patterns. Firebase powers the real-time data synchronization and user authentication. The platform supports decision-making for zoning regulations, traffic management, environmental compliance, and sustainable city development initiatives.