Smartwatches are gaining popularity, with 89 companies selling 6.8 million units in 2014. The Apple Watch launched in 2015 and uses a thin client model where the watch interface resources are on the watch but code executes on the paired iPhone. The Apple Watch kit provides several basic UI elements like buttons, labels, and images that can be used to build watch apps. Interaction is via taps, swipes and gestures. Notifications can have short and long interfaces. While customization is limited, animations and settings can be used. Third party apps cannot make calls and access to sensors is not allowed. The future of smartwatches looks promising but improvements could be made to address quality, privacy and customization concerns.