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 show charts on your website.

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Get the latest version of RGraph (version 6.17) from the download page. There's also older versions available, minified files and links to cdnjs.com 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 (£99) commercial license available.

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I want to use the RGraph source for commercial purposes.
It is said that there is no restriction in the main text, but there may be a misunderstanding, so please inquire.

1. Inquire if it is possible to use the source for commercial use.
2. If possible, I would like to know what the restrictions are.

> I want to use the RGraph source for commercial purposes.
> It is said that there is no restriction in the main text,
> but there may be a misunderstanding, so please inquire.

No misunderstanding - feel free to use it as much as you want for whatever purpose you choose.

> 1. Inquire if it is possible to use the source for
> commercial use.

Yes.

> 2. If possible, I would like to know what the restrictions
> are.

None - there aren't any.

UPDATE:

There's now a commercial license option if you prefer this to the Open Source license. See https://www.rgraph.net/license.html for more information. The Open Source (the GPL license) usage option is available for you to use if you're happy to use it that way.