Every colour, font, radius and spacing in an app's CSS becomes a knob, and the real app follows 1:1. Start from one of eight UI kits (shadcn/ui, Tailwind CSS, daisyUI, Bootstrap, Material 3, Radix Themes, Mantine, Ant Design) or bring your own build, a public repo or your running app. What you keep comes out as a design system and a skill for your agent, a patch, or design tokens. Nothing is sent to a server. How it works · Source · llms.txt · MCP server