Google yesterday released Photo Sphere for iOS devices. Photo Spheres have been a staple of the Android camera since Android 4.1 Jelly Bean, and the release of the Photo Sphere Camera App for iOS is the first time that Google has extracted a feature of an App to specifically release it for a particular Mobile OS.
Google has previously extracted the Photos App from Google + only for Android and Hangouts on all supported Mobile Platforms, but making a feature of an App as a dedicated App only available on iOS is a first for any developer.