There is literally no UI chrome in Clear. No status bar, tabs — hell there aren’t even any buttons in the app. The entire app is driven by gestures, movements, and taps.
The components of Clear are very sharp. The interface is crisp, the experience is stellar, and everything is fluid. Despite the spartan interface, there is a certain richness that strictly dedicates Clear to Apple’s hardware. I do not think Clear would work on Android for example.