After a brief delay on Apple’s part, HealthKit-compatible apps are now available in the App Store. Finally! Thanks to this back-end feature, you can view all of the health data that your iPhone 5s, 6, or 6 Plus is already tracking within other apps, and view everything within a single app of your choosing—be it Apple’s own Health app, or another third-party app.
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SOURCE:
https://www.macworld.com/article/2690816/healthkit-app-lark-talks-to-you-to-help-you-stay-active.html