Earlier this year, both Apple and Google presented competing visions for how we'll use apps and wearables to gather data about our bodies and share it via our phones. Apple called its software HealthKit, while Google presented Google Fit.

If things had gone according to plan on Wednesday, Apple would be enjoying a head start over Google, with HealthKit released along with iOS 8, its new mobile software for iPhones and iPads. (Google Fit is still unreleased beyond a "developer preview.")