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|Version of OS X|
OS X Mavericks, or OS X 10.9, is the tenth major release of the OS X operating system released on 22 October 2013. It was announced on 10 June 2013 at WWDC. This version focuses on battery life improvements, and increased iCloud integration.
Although OS X Mavericks was released together with iOS 7, OS X Mavericks retains a similar user interface design from previous OS X versions. The modern interface wouldn't be utilized until OS X Yosemite in 2014.
It is the first OS X version to be released as a free upgrade on the App Store.