I want to know how a particular application for iOS works. I only need that what frameworks/libraries might have been used to built that app.
Where can I ask such a question?
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Currently, we do not have any sites in the SE universe which would take this question.
This question will be very broad, and highly dependent on guess-work. So, it is also not a great example of a StackExchange-style post.
I only need that what frameworks/libraries might have been used to built that app
Due to the rise in the number of frameworks and libraries these days, there can be multiple guesses(/answers) for such a question. And, on top of that, this question can never have an accepted answer, cause all the answers would be pure guesswork, unless and until the author of the app answers it.
On Reverse Engineering, you can ask about how to examine the contents of an .ipa archive. That said, your question has to ask about the technique; you will be doing the analysis yourself.