TopoBandix is a unique photonic design companion that transforms complex concepts of topological band inversion into an accessible, interactive tool. By combining input parameters such as lattice constant, dielectric contrast, coupling strength, and wavelength, it provides instant insight into whether band inversion occurs and predicts edge-state propagation length in a clean, visually appealing interface. With its gradient-rich design and streamlined workflow, the app offers both practicality for circuit engineers and clarity for learners, making advanced photonic analysis simple, engaging, and portable.