This logo was used from iPhone OS 1 to iOS 5. YouTube app was removed in iOS 6. The service in that app was still functional until April 2015, when V2 of the YouTube Data API ceased to function.
App Store version
This logo was used from version 2.0 to 10.38, on iOS 6 to 9.
This logo was used from version 10.38 to 12.33, on iOS 7 to 10.
2017–presentThis logo is used from version 10.38 onwards, on iOS 9 onwards.
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