coss ui

coss ui is a component library built on Base UI and styled with Tailwind CSS, made by the Cal.com team, which is adopting it progressively, and meant to be copied, pasted and owned. It covers a full app set, from autocomplete, comboboxes and a command palette to scrubbable number fields, meters, segmented controls and a drawer with snap points, and ships a Radix migration guide plus skills and llms.txt for AI tools. Teams building product UI on Base UI primitives get a ready design here, and teams on Radix get a clear path across.