Frequency Explorer

Frequency Explorer, from FAMS Design Solutions, performs rainfall frequency analysis in the browser: upload an annual-maximum series, and it fits eleven candidate distributions — GEV, Gumbel, Log-Pearson III, Log-Normal, Log-Logistic, TCEV and others — ranks them by goodness-of-fit (Kolmogorov-Smirnov, chi-square), and reports design rainfall estimates with 95% confidence bounds.

Where national IDF services exist (NOAA Atlas 14, the ARR Data Hub) they remain the compliance answer; this tool earns its place for everywhere else — gauge-based frequency work in regions without an official service, or as an independent check with uncertainty bounds included. Free to use at the time of listing.