Apple's HealthKit API enables health and fitness apps to share their data, both with the new iOS 8 Health application and with each other. HealthKit can serve as a hub for all the health and fitness apps on an iOS device. This allows consumers to have more oversight of their health and fitness.
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Apple iOS 8 opens new areas of iOS and enables developers to extend the content and functionality of their applications. Developers can create customized experiences in the realms of photo editing, sharing, notifications, keyboard, documents, and actions. There are over 4,000 new APIs enabling new capabilities and features. Some of the major new APIs, which cover gaming, photo tools, health/fitness, the cloud, home automation, etc., include Metal, SceneKit, SpriteKit, CloudKit, HomeKit, HealthKit, Camera, PhotoKit, Swift, and TouchID.