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I remember (perhaps wrongly) an AirBNB update being several megabytes, implying the entire app. Today's update is only 129 KB. Are they allowed to just update portions like MacOS updates?

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The iOS App Store supports delta updates since iOS 6.

In iOS 6 to 7.0.x, changed files are downloaded when updating an app. Since iOS 7.1, only the changes in each file are downloaded, reducing the update size even further.

https://developer.apple.com/library/content/qa/qa1779/_index.html

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