WatchKit & Watch App 1. Watch App is mini version of an iPhone app 2. Require an iPhone 3. WatchKit app is as iPhone app Extension 4. Deliver to App Store with iPhone app 5. Installed through iPhone 

Parts of WatchKit App 1. Watch App - Interface 2. WatchKit Extension - App Code (Business logic) 

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Watch App 1. Simple Layout for positioning elements 1. No X,Y coordinates 2. Vertical or Horizontal Grouping 2. Interface an Navigation can't be changed at runtime 3. Can't add or remove UI elements 4. No animations support 5. A bit poor UI collection 

WatchKit Extension 1. Runs on iPhone 2. Control User Interface throw IBOutlet connections 3. View Controllers and App logic. 4. One way data - flow (can set, can't read) 5. Simple in use 6. UI objects are proxy objects (delayed method calls) 

Limitations 1. No access to Hardware 2. Not fully native Watch App (promised in 2015) 3. Not able to run code on Watch 4. Poor UI components library 

But still Its Mega Powerful 

Why So many limitations? 1. Bad hardware? 2. Test version? 

The Future New era of body devices - Always with you - Immediate access Not a minim iPhone app 1. Place reminders 2. Body tracker reminders 3. Body measurement 

To infinity ... and beyond 

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Go and Make Future !