Velvet UI is a headless React library for sheets and toasts that feel at home on every device. Browser-native WAAPI animations and custom physics power fluid dragging, scrolling, snapping, touch gestures, trackpad swipes, mouse-wheel input, and interruptible motion. It is accessible, deeply customizable, tree-shakeable, and dependency-free beyond React. Use it with your own styles or with Base UI, Radix UI, and React Aria.