A Stream Graph (Streamgraph) is a variation of stacked area charts used to display trends of multiple data series over time. The chart presents a flowing river shape, where each stream represents a data series and the width of the stream indicates the magnitude of the value. This tool supports custom timelines, multiple data series, color configuration, stack modes, and more. Generated charts can be exported as PNG or SVG. Use cases: website traffic analysis, sales trend comparison, social media topic heat, music genre popularity changes, and other multi-dimensional time series data visualizations.