UICapsule

UICapsule is Kaiyu Hsu's curated, MIT-licensed gallery of 53 interactive React components, each running live rather than shown as a screenshot. It favours interactions the web rarely has, borrowed from phones, hardware and physical objects, such as a dynamic island, a volume dial, an ASCII renderer and a scrubbable terminal, and every one installs as a shadcn registry item with its dependencies listed. Reach for it when the brief calls for one specific interaction rather than a design system, and agents can use its machine-readable endpoints to find the right one.