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Just from a cursory glance, it appears that Chartjs is entirely free and you can do what you want with it, while Highcharts is not.

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It would be nice if this distinction was stated unambiguously on the front page

here's the license if you were looking for it like I was

https://github.com/nnnick/Chart.js/blob/master/LICENSE.md

Took me ages to find the license, I ended up clicking documentation and still having to search for the word license to find it. I wish it was more prominent on the landing page.

Highcharts is free for non commercial

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