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Aside from Quartz (aka doityourself) there are some third party charting libraries and google charts.
 
what do you mean draw it yourself? i want the graph to like change overtime depending on what the user does
 
Do they speak Russian in Picksburgh?

Regarding the app I wonder if you'll make a similar app for wife and mistress? Crazy doesn't begin to describe them ;-)

Anyway, as I mentioned there are third party graphing libraries for iOS apps.
 
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