I don't have access to the source code but only the .ipa file and I'm to confirm as the QA to the project the swift version used to develop the .ipa file, how do I? I can get the iOS version using this command on the terminal. plutil -p Payload/MyData.app/Info.plist | grep DTSDKName I have read through the Info.plist file and can't find any unique identifier that could show the app is built with Swift 5.