Atlyn Tornado Chart

Atlyn Tornado Chart compares two measures with mirrored horizontal bars around a shared category axis. It makes differences between current and prior periods, budget and actual, left and right cohorts, products, regions, or competitors easy to scan. The visual supports signed values, percentage mode, sorting, model-format-aware labels and tooltips, selection and cross-filtering, keyboard operation, high contrast, responsive narrow layouts, scrolling for large category sets, rendering events, and both empty-space and data-point context menus. Common uses include demographic comparisons, procurement and spend analysis, survey results, competitor analysis, and scenario planning. The visual is free for personal and commercial use under the MIT License; no purchase, subscription, account, or license key is required.