Open Source: Plotting Libraries For Easy Charts Without The Cost
I have received inquiries quit a few times from visiting developers asking about available open source libraries for creating charts on iOS devices. It is definitely understandable as many of the commercial charting libraries come with a very hefty up front cost.
While there are quite a few open source libraries that have charting and plotting features that run on iOS here are a few that are designed specifically for this purpose allowing you to draw many different kinds of graphs.
You can see examples of some of the chart types supported
You will be able to create nearly any chart using the libraries mentioned above, but if not you might want to mention your chart ideas in the