Most design systems give you components without opinions. You copy them, manually style each one, and inevitably drift. Sigil takes a different approach: one DESIGN.md file controls your entire visual identity. 519 tokens across 33 categories — colors, typography, spacing, radius, shadows, motion, page composition, and more. 350+ components read those tokens through CSS custom properties.
Edit the markdown. Run sigil design compile. CSS custom properties and Tailwind v4 regenerate. Every component updates. No grep-and-replace. No component-level edits. 46 curated presets swap all 519 tokens at once — not a color toggle, a completely different design language.
Sigil ships a CLI for project setup, DESIGN.md generation, preset management, and health checks; a drag-and-drop sandbox for composing pages; and auto-generated agent instructions so AI agents can build with it immediately.
Built by Kevin Liu.