How do I extract an app from an iPhone? [closed]

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Closed 11 years ago.

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I built an ad hoc ipa a few weeks ago and now I need to extract it from the only device it now exists on. Is this possible and if so how? It seems that iTunes only lets you reverse sync purchased apps.

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With an app like this

Edit: forgot to say, you'll get the actual .app, not the .ipa.