The idea behind this tool was to mimic the behaviour of flash based, xml driven charts. Although it is not easy to reach the quality of such charts with simple ajax and php, it still has some advantages. Primarily the code can be read by any browser without installing plugins and the search engines can spider it. Furthermore it's a real lightweight alternative compared to many flash solutions and the actual charts are sufficient to display data.
CSS Chart Generator is free for use. No costs implied for the basic version. You can use it on any website.
The free version shows a copyright notice in the x-axis title, while the pro version is free from any backlinks or ads and has much more functionality.
For most people who simply need a chart from time to time, the free version just matches perfectly. It displays data in a nice manner, and that's all it should do. The pro's out there will surely honor the additional effects and layout possibilites to style their charts thoroughly. For that, we charge a flat fee of 5 € per month, which we think is adequate for the effort and work we have put into creating this tool.
The pro version is 5 Euro for a period of 30 days. In addition, you will gain access to the download section where you can find nifty widgets to enhance your css charts.