This logo was used from iPhone OS 1 to iOS 5. The default 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
After the default YouTube app was removed in iOS 6, the YouTube app from Google was available on the App Store since the release of iOS 6 in late 2012. This logo was used from version 1.0 to 2.0, on iOS 4 to 7.0.6.
This logo was used from version 2.0 to 10.38, on iOS 7.1 to 9.
This logo was used from version 10.38 onwards, on iOS 9 onwards.
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