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Is Google Chart API free to use? If so, where can I find its documentation?
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Google chart tools are powerful, simple to use, and free. Try out our rich gallery of interactive charts and data tools.
Google Charts is open source and is free to use.
Can I use charts offline? Your users' computers must have access to https://www.gstatic.com/charts/loader.js in order to use the interactive features of Google Charts. This is because the visualization libraries that your page requires are loaded dynamically before you use them.
The Google Chart API is an extremely simple tool that lets you easily create a chart from some data and embed it in a webpage. You embed the data and formatting parameters in an HTTP request, and Google returns a PNG image of the chart.
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
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