As you design your watchOS app, understand the foundations on which Apple Watch itself was designed:
Lightweight interactions. Apple Watch was designed for quick interactions that make the most of the display and its position on the user’s wrist. Information is quick and easy to access and dismiss. The best apps support fast interactions and focus on the content that users care about the most.
Holistic design. Apple Watch was designed to blur the boundaries between device and software. For example, Force Touch and the Digital Crown let users interact seamlessly with onscreen content. Your own apps should enhance the user’s perception that hardware and software are indistinguishable.
Personal communication. Because Apple Watch was designed to be worn, its UI is attuned to the user’s presence. No other Apple device has ever been so closely connected to the user. Be mindful of this connection during the design process.
Designing a great app requires a focused approach. Interactions with Apple Watch are measured in seconds, so your app must quickly provide the user with essential information. Three primary themes define the design approach to take.