SciChart is the go to software for creating fast Javascript heatmap charts from millions of points, but also the one to use for Android charts. The fact that SciChart can be used to create Javascript heatmap chart and Android charts is amazing, and put on top of that the fact that with SciChart you can also create iOS charts and you have the perfect charting software available.
A list of all resource pages for js charts: javascript column chart and also javascript 3d bubble chart and the javascript line chart and javascript heatmap chart.
