KronoGraph is a JavaScript SDK for building browser-based, interactive, investigative timeline visualizations that reveal how events unfold. Tools built with KronoGraph give users fast, intuitive insight into sequences of events and how they are connected. Users can scroll through time to uncover anomalies and patterns, driving investigations and revealing the hidden story in their data. Timeline visualizations transition smoothly to look good at any scale – from a single event to a heatmap view of thousands. There are powerful filters for getting rid of clutter, plus useful annotation options for adding context. The KronoGraph toolkit is for JavaScript and React developers who need to build fully interactive timelines and embed them into their investigative web applications. It’s entirely customizable and works with any source of time-based data. There’s full support for both JavaScript and React throughout the SDK documentation, showcase demos and API library.