This looks neat, but as a dataviz person who works on the web, my first question (which I couldn’t find an answer to, though I was skimming) is why would I use a special-purpose tool for these kinds of charts when D3 already supports these kinds of charts pretty thoroughly, allows me to update data in realtime and supports animation. Plus D3 can render to either SVG or canvas, it even supports offline rendering for creating vector-based charts for print purposes.