Codex

Codex is the official design system for Wikimedia that provides a unified toolkit and guidelines for user interface design.

It includes design tokens for consistent styling, a library of UI components built for accessibility and internationalization, a set of icons with language and directionality variants, and supports Vue-based and CSS-only implementations.

According to our data, Codex is the 5th most popular design system on the web.
It has 1.8% of the design system market share and is detected on 0.01% of all websites.

• 🏠 Website
  • doc.wikimedia.org/codex/latest/
• 🔗 Links
  • mediawiki.org/wiki/Codex
• </> Source code
  • GitHub

📊 Rankings and Market Share

• Design Systems
  • Rank: 5
  • Market share: 1.8%

🏆 Codex Awards

• 🥈 Second most popular in Germany in the Design Systems category.
• ⭐ 4th most popular in the United States in the Design Systems category.

⚡ Sites Using Codex

We have data on 400 websites that use the Codex design system. Here is a list of some of the top ranked ones.

The highest rated site using Codex is en.wikipedia.org.

#	Website	Rank	Country	Language
1	en.wikipedia.org		United States	English
2	es.wikipedia.org		United States	Spanish
3	wikisource.org	#1,317	United States	English
4	commons.wikimedia.org		United States	English
5	mediawiki.org	#2,098	United States	English
6	runescape.wiki	#2,112	United States	British English
7	upload.wikimedia.org		United States	English
8	wikidata.org	#2,908	United States	English
9	de.wikipedia.org		United States	German
10	ja.wikipedia.org		United States	Japanese
11	fr.wikipedia.org		United States	French
12	minecraft.wiki	#6,019	United Kingdom	English
13	zh.wikipedia.org		United States	Chinese
14	wikidex.net	#10,356	Spain	Spanish
15	bg3.wiki	#10,366	Germany	English
16	novaposhta.ua	#11,526	Ukraine	Ukrainian
17	it.wikipedia.org		United States	Italian
18	pl.wikipedia.org		United States	Polish
19	pokemoncentral.it	#18,027	Italy	Italian
20	pt.wikipedia.org		United States	Portuguese

🕵️ Similar Technologies

These are some of the best Codex alternatives.

Rank	Name
1	Material Design Mountain View, California, United States A design system developed by Google that defines a unified visual and interaction language used across Android, web, and other platforms.
3	Italia Design System Rome, Italy A national design system that defines principles, guidelines, and reusable resources for designing websites and digital services for the Italian public administration. FreeOpen source
4	USWDS Washington, D.C., United States An open-source design system developed by the United States government to help federal agencies build fast, accessible, and mobile-friendly websites. FreeOpen source
6	Fluent Redmond, Washington, United States Design System is Microsoft's cross-platform design language that defines how user interfaces should look and behave across Windows, web, and mobile applications.
7	GOV.UK Design System London, United Kingdom An open-source design system that provides styles, components, and patterns to help UK government teams build consistent, user-centered digital services. FreeOpen source

🆚 Compare Alternatives

Compare Codex to…

• 🕵️ Similar systems
  • Codex vs. Material Design
  • Codex vs. Italia Design System
  • Codex vs. USWDS
  • Codex vs. Fluent
  • Codex vs. GOV.UK Design System
• 🔎 All options
  Ant DesignAtlassian UICalcite Design SystemCarbon Design SystemFluentGOV.UK Design SystemItalia Design SystemMaterial DesignSAPUI5Singapore Government Design SystemSpectrum Web ComponentsUber BaseUSWDSCompare

💬 Frequently Asked Questions

👉 See Also

• 💼 All technologies from Wikimedia Foundation

🗃️ About This Data

• We evaluate the popularity of technologies based on the number of websites where we detect their usage.
• Technologies without a detectable web footprint, and those we do not track, are not reflected in the calculated market share.
• This report is based on the analysis of 3,375,483 websites.
• Statistics were last calculated on May 5, 2026.
• For more details, see our methodology and disclaimer.