How do you check how many people are using your app via, say, iOS 3 versus iOS 4? How did this developer, for example, make a graph of his version distribution? I would like to know my personal version distribution to better allocate my development time.
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There are some external sources that you can use for this tracking, which also provide analytics reporting. I have been using Localytics in my apps, which is free. It was extremely easy to work with, in my experience.