Is Google Chart Tool Api is free to use [closed]

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Is Google Chart API free to use? If so, where can I find its documentation?

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Yes, it is free. It is written in the official page:

Completely free for all uses: commercial, governmental, personal or educational.

For documentation follow this link.

Edit: You don't really download it. You include the following in your code:

<script type="text/javascript" src="http://www.google.com/jsapi"></script>

Then you start using it as shown here.

If you really want to see how it looks like inside, you can paste this to your browser address bar: http://www.google.com/jsapi

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its completely free. You can check the different chart from below link

http://code.google.com/apis/ajax/playground/?type=visualization