Head-To-Head: Apple iPhone 5S Vs. Samsung Galaxy S4

Operating System

Apple's iPhone 5S runs iOS 7, a 64-bit version of Apple's mobile operating system built for its new 64-bit SoC. It includes a native 64-bit kernel as well as 64-bit versions of all libraries and drivers. What's more, Apple has re-engineered all of the apps included with iPhone 5S so they too run natively on 64-bit iOS 7. In the meantime, Apple ensures a "seamless developer transition" with the ability to run 32-bit apps on its 64-bit OS and is publishing guidance for compiling 64-bit code using XCode. As revealed at WWDC in June, Apple also is moving iOS toward multitasking, something that Samsung has been doing for more than a year.

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