Screenshots from the Heatmapper2 homepage, showcasing navigation options. The top navigation bar (A) contains links to each heat mapping class (Expression, Pairwise, Image Overlay, Geomap, Geocoordinate, 3D, Spatial, Spectral), as well as an About page containing usage instructions, documentation, and source code. Heatmapper2’s eight heat map classes can alternatively be accessed via panels on the lower half of the homepage (B). Clicking on a panel redirects the user to that heat map class, while hovering over the panel image flips the panel to display additional text information.