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Highcharts is beautiful but it's quite expensive for a startup in my country (VN). While the budget for a nascent webapp is around $1000. I choose Flot as the replacement. It's flexible and nice enough with responsive layout, compound charts, clearly script.

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I used flot too, as a replacement for Highcharts.

The only downside I dislike about flot is that it depends on JQuery. As I otherwise don't rely on JQuery at all, it means another ~80kb of additional JS code. Beside that, flot seem to be a very good free alternative.

I started out with flot after noticing the high cost of Highcharts. But now have been switching out flot with dimple.js and d3.js. The charts are much better with dimple/d3.

Interesting. I considered graph libs based on-top of D3. But D3 is equally big in JS file size to JQuery. And SVG wasn't supported in older Android (2.3) and slower in Firefox and Chrome 3 years ago. So flot with its Canvas rendering "won" in the end.

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