This visualization tool is designed specifically for extreme value analysis. It supports inputting sample data, fitting three common extreme value distributions (Gumbel, Fréchet, and Weibull) with one click, and plotting the fitted curves and sample histograms, helping users intuitively understand the probability of extreme events. The application also includes a built-in threshold calculation function that automatically outputs estimates of P(X > x), making it suitable for risk assessment, extreme weather, financial anomalies, and other fields. Users can export analysis reports as PDFs and save historical records for easy review and teaching demonstrations.