Although you can’t yet buy an Apple Watch — it will launch in early 2015 — developers can start building software for the device. Apple released the iOS 8.2 WatchKit SDK this week in beta form.
Developers initially have three choices when coding for the Apple Watch. Glances are simple informational notifications while Actionable Notifications allow for some very limited user interaction. WatchKit apps are also supported by the beta SDK but they’re not standalone apps. Instead, these are extensions of apps built for the iPhone.