The Bottom Line
The iPhone 5s runs iOS 7, the world's first and still the only 64-bit mobile operating system, plus 64-bit versions of all apps, libraries and drivers. The HTC One runs the mature and refined Android 4.4.2 Kit Kat plus version 6.0 of HTC's good-looking and customizable Sense UI overlay. Both platforms offer countless apps, and power efficiency that seems to get better with each passing day. The iPhone 5s has been available since September starting at around $200 with a contract from AT&T, Sprint, T-Mobile or Verizon. The HTC One began shipping in April for the same networks, and in unlocked and developer editions for $699 list.