@pout said: Why don't you just send the data through JSON to a htmlpage and use that combined with existing chart creator? Like this one: http://www.anychart.com/products/anychart/overview/ Should be pretty simple. Are you in the correct topic, Pout? AnyChart does not produce diagrams, it produces charts. And yes it's a minimum of 500 dollars "simple". Jim had some success using GraphViz, which actually has two examples of state diagrams: finite state machine* LR(0) state graph