design-extract

Design Extract

Extract any website's design system from its public URL. No login, no API key, no Figma.

When to use

• User pastes a URL and wants to understand its visual design
• User wants to replicate a site's look and feel
• User asks "what design system does X use?"
• User wants a DESIGN.md for AI context
• User wants to match an existing site's tokens in their own project

How it works

1. Fetch the URL's HTML and all linked stylesheets
2. Parse CSS for: custom properties, colors, fonts, spacing, radii, shadows
3. Send extracted raw data to Claude for structured synthesis
4. Output a DESIGN.md with: color system, typography, spacing, borders, component patterns, Tailwind config sketch

Usage

# CLI
memi design-doc https://linear.app
memi design-doc https://stripe.com --spec    # also write a DesignSpec JSON
memi extract https://vercel.com              # alias

# MCP tool
design_doc({ url: "https://linear.app" })

Output format

The DESIGN.md contains:

• Color System -- palette with semantic names (primary, bg, fg, muted, accent)
• Typography -- font stacks, size scale, weight usage
• Spacing -- scale (4px/8px grid or other rhythm)
• Borders & Surfaces -- radii, shadows, border styles
• Component Patterns -- inferred from DOM (buttons, cards, inputs, nav)
• Tailwind Config Sketch -- partial tailwind.config.js with extend values

Success criteria

• Extraction completes in under 30 seconds for any public URL
• Output contains at least 10 distinct design tokens
• Tailwind config sketch is valid JavaScript
• DESIGN.md is immediately usable as AI prompt context

Limitations

• Does not work on pure client-side rendered apps (CSR) that inject all styles via JS at runtime
• Works on: static sites, SSR (Next.js, Remix, SvelteKit), and any site that serves CSS in <link> or <style> tags