.net Powerful JavaScript charts
RGraph is a JavaScript charts library based on HTML5 SVG and canvas. RGraph is mature (over 15 years old) and has a wealth of features making it an ideal choice to use for showing charts on your website.

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Get the latest version of RGraph (version 6.18, 1st June 2024) from the download page. You can read the changelog here. There's also older versions available, minified files and links to hosted libraries.

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RGraph can be used for free under the GPL or if that doesn't suit your situation there's an inexpensive (£129) commercial license available.

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A non-filled Radar chart

[No canvas support]

Here's a Radar chart that happens to have two datasets. By default, Radar charts look a little different, with a fill color applied. This can be set to transparent though, as is the case here, giving us this style of appearance.

The labels are set to only be drawn on the north axis, the textSize has been increased to 16 and the top label (on the "north" axis) has been set to be blank as it would clash with the scale labels.

The axes on the chart have also been disabled.

This goes in the documents header:
<script src="RGraph.common.core.js"></script>
<script src="RGraph.radar.js"></script>
Put this where you want the chart to show up:
<div style="float: right">
    <canvas id="cvs" width="500" height="400">[No canvas support]</canvas>
This is the code that generates the chart - it should be placed AFTER the canvas tag(s):
    // Create and configure the Radar chart so that it's not filled and
    // only has the labels on the north axis. The text size has been
    // slightly increased.
    new RGraph.Radar({
        id: 'cvs',
        data: [
        options: {
            backgroundCirclesPoly: true,
            backgroundCirclesSpacing: 30,
            colors: ['transparent'],
            axesColor: 'transparent',
            highlights: true,
            colorsStroke: ['red', 'black'],
            linewidth: 3,
            labels: ['', 'Barry', 'Gary','Dave','Paul','Rich'],
            labelsAxes: 'n',
            textSize: 16,
            responsive: [
                {maxWidth: null, width: 500, height: 400,parentCss:{'float':'right', textAlign:'center'}},
                {maxWidth: 700,  width: 300, height: 300,parentCss:{'float':'none', textAlign:'center'}}