This is pretty cool, but $300 is a lot to pay, even for commercial use. There are a lot of free client-side charting projects out there. Charts.js was a recent

This is pretty cool, but $300 is a lot to pay, even for commercial use. There are a lot of free client-side charting projects out there. Charts.js was a recent one on HN: http://www.chartjs.org/ http://www.chartjs.org/ While this new one does offer interaction between charts, that wouldn't be too hard to add into other existing free projects that have event systems to hook into. I'd say $50 - $99 would make it more worthwhile.