InCHlib (Interactive Cluster Heatmap library) is an open source interactive Javascript library which provides an easy way to display and analyze hierarchically clustered data and cluster heatmaps. It implements a raster-based HTML5 canvas visualization using the open source Javascript framework KonvaJS. InCHlib is multiplatform and works in all major internet browsers (Internet Explorer, Mozilla Firefox, Google Chrome, Safari, Opera). Its speed is determined by the client’s hardware and internet browser. For smoothest user experience, we recommend Google Chrome.