Design System v4.4

About Design System Builder v4.4

Token-driven UI engine · live preview · production CSS

Design System Builder is an open-source playground for designers and front-end engineers. Define primitive and semantic tokens, preview a full component library instantly, and copy production-ready CSS.

Everything runs locally in your browser — no backend, no tracking. Generated CSS is provided as-is: component styling is a reference implementation, not a drop-in production framework.