iOS is the favored child at Apple these days. Most new features in Mavericks — and, indeed, in OS X Lion before — were features that came first on iOS, and even the Darwin Kernel version in iOS is always one version ahead of its OS X counterpart. The Mac still doesn’t have Siri, the iPhone’s iconic chatty assistant, but it does have a leg up on iOS in one Siri-like feature: Dictation.
Dictation has its roots in Mac OS Classic’s PlainTalk Speakable Items introduced in the days of System 7 in 1993. That core is the tried-and-true VoiceOver and Voice Commands in OS X, but it never was perfect for dictating text. Then iOS and Siri came along, and Apple brought iOS-style server-powered dictation to the Mac with Mountain Lion. It was far more accurate, but far more limited, and required you to be online for dictation to work.
In Mavericks, Dictation on the Mac has once again pulled ahead of its iOS counterpart, with continuous, offline dictation that works as good or better than the version in Mountain Lion. And there’s still the voice commands, now in a reworked settings pane, that together make the Mac the most accessible computer out-of-the-box.