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Website → Design System

Turn any website into a usable design system.

Extract colors, typography, spacing, radii and visual tokens from a public website.

Try an example:

Only public CSS is inspected, through a safe server proxy — no logins, no cookies, nothing stored.

Extract a design system from any website

Website → Design System turns any public website into a usable, developer-friendly design system. Paste a URL and it reads the page’s HTML and CSS and extracts its visual language — a colour palette, typography (families, a type scale, weights), spacing, border radii and shadows — then hands you a copyable CSS-variables and JSON token export. Every value is backed by real CSS evidence and shows how often it was found; nothing is invented, and real CSS custom properties are preserved separately from values that were merely observed.

How to extract a design system

Turn a website into tokens in under a minute:

  1. Enter a public URL — e.g. https://example.com — and press Analyze Website.
  2. The page and its linked stylesheets are fetched through a safe server proxy (no cookies or credentials) and parsed in your browser.
  3. Explore the dashboard — colours, typography, spacing, radii and shadows, each with occurrence counts and source metadata.
  4. Open the Tokens tab to copy or download the generated CSS variables and JSON, plus any real CSS custom properties found in the source.

What it extracts

  • Colour palette. Hex, rgb/rgba and hsl colours — including gradient stops and CSS custom properties — de-duplicated with occurrence counts and where each was used.
  • Typography. Font families, a sorted type scale, weights, line-heights and letter-spacing, with a live preview in the site’s primary font.
  • Spacing, radii & shadows. Observed margin/padding/gap values, a border-radius system, and grouped box/text shadows you can copy as raw CSS.
  • Honest tokens. Real CSS custom properties are preserved verbatim; generated variables use an --ems-extracted- prefix so nothing pretends to be an original token.

Frequently asked questions

What does Website → Design System extract?

Enter any public website URL and it reads the page’s HTML and CSS (style blocks, inline styles and linked stylesheets) and extracts its visual language: a colour palette (hex/rgb/rgba/hsl, including gradient stops and CSS custom properties), typography (font families, a type scale, weights, line-heights and letter-spacing), observed spacing values, border-radius values and box/text shadows — plus a copyable CSS and JSON token export.

Are the extracted values “official” design tokens?

Only when they actually are. Values aggregated from usage are labelled “observed” or “frequently used” — never given invented semantic names like “primary”. Real CSS custom properties found in the source (e.g. --brand-500, --radius-md) are preserved separately, with their exact names and values, so you can tell the difference.

How does it read another site’s CSS without CORS problems?

A browser cannot read another origin’s stylesheets directly. The page and its linked CSS are fetched through a server-side proxy that only reaches public hosts (it blocks private, loopback, link-local and cloud-metadata addresses), forwards no cookies or credentials, and caps size and time. Extraction then runs locally in your browser.

Is the output deterministic?

Yes. Given the same HTML/CSS, the extractor always produces the same colours, type scale, spacing, radii, shadows and exports — everything is sorted deterministically. There is no AI and no randomness in Phase 1.

Is it private and safe?

Yes. It only inspects publicly available CSS, never logs in, forwards no credentials, and the JSON/CSS exports contain only design values and source metadata — never cookies, headers or private data. Nothing you analyze is stored on our servers.

What if a site loads styles with JavaScript?

It inspects the HTML and CSS as served (static style blocks, inline styles and linked stylesheets). Styles injected at runtime by JavaScript may not be visible, in which case the tool says so rather than pretending the extraction is complete.

How does UI pattern detection avoid false positives?

Patterns (buttons, cards, inputs, links, badges, navigation and more) are detected from multiple signals — semantic element, class-name hints and the resolved CSS/structure — not tag names alone. Similar elements are clustered into variants, and each pattern carries a confidence and an evidence level (observed, suggested, inferred or confirmed). When evidence is weak the tool shows a low confidence or nothing at all, rather than a confident guess. The consistency detector likewise only flags near-duplicate values and rare outliers where there is deterministic evidence — intentional variation is not flagged, and there is no subjective “consistency score”.

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