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# WKCompanionAppBundleIdentifier

The bundle ID of the watchOS app’s companion iOS app.

## Discussion

Xcode automatically includes this key in the WatchKit app’s information property list when you create a watchOS project from a template. The value should be the same as the iOS app’s [`CFBundleIdentifier`](/documentation/BundleResources/Information-Property-List/CFBundleIdentifier).

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