Carbon Design System vs U.S. Web Design System
Carbon Design System
carbondesignsystem.com
U.S. Web Design System
designsystem.digital.govSide by side
| Figure | Carbon Design System | U.S. Web Design System |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| Self-hosted | — | Yes |
| Plans published | 1 | 1 |
| Spec score · UI Kit Libraries | 8.4 (#3) | 7.1 (#24) |
| Components | Carbon components are designed and coded to solve specific UI problems and work together as parts of a larger system. | The system includes components with user experience, accessibility, and implementation guidance. |
| Integrations | The ecosystem includes Carbon for Cloud, Carbon for AEM, Carbon for IBMer Experience, Carbon for Salesforce, and Carbon React Native. | The recommended developer setup uses Node and npm, and the system can be installed as a project dependency through npm. |
| Purpose | Carbon provides reusable assets to help teams build consistent digital experiences faster. | USWDS is a toolkit of principles, guidance, and code for building accessible, mobile-friendly government websites. |
| Support | Carbon directs users to GitHub issues and provides support by email at [email protected]. | Users can ask questions in GitHub Discussions or email the USWDS team at [email protected]. |
Plans
In their own words
Carbon Design System
Carbon Design System is IBM’s open-source design system for digital products, shaped by the IBM Design Language. Carbon Core provides foundations, components, patterns, code, and guidance for teams building consistent digital experiences. Carbon for Products adds product-oriented components, styling, and guidance, with components built using React. The wider ecosystem includes Carbon for AI guidelines and reusable elements, Carbon Charts, and integrations such as Carbon for Cloud, Carbon for AEM, and Carbon React Native. Design kits maintained in Figma receive library updates automatically. Carbon MCP lets AI applications or agents query colors, typography, component details, and usage guidance. Web components are available as ES modules or through a CDN and can be used with frameworks such as Angular or Ember. Developer resources include GitHub repositories, Storybooks, tutorials, Carbon Devtools, a color-contrast checker, and UI Builder. The builder can export presentation images, demo apps, or frontend code. Components follow accessibility checks based on IBM’s checklist. Carbon is free to use and contribute to, with no paid tiers stated. Its patterns cannot include code for every possible implementation.
U.S. Web Design System
U.S. Web Design System (USWDS) is an open-source toolkit for government teams creating accessible, mobile-friendly websites. It combines principles, guidance, and code with components that include user-experience, accessibility, and implementation guidance. Teams get patterns, design tokens, utilities, and page templates, then install and compile the system to customize projects. Node and npm are the recommended setup, and USWDS can be added as an npm dependency. Downloadable design kits support Figma and Sketch. USWDS says its guidance and code address Section 508 and 21st Century IDEA requirements from the outset. Version 3.0 supports Chrome, Firefox, Safari, and Edge, but not Internet Explorer 11. Security practices include Snyk dependency checks, CodeQL analysis, release vulnerability reports, and patches for 1.x and 2.x branches. It is free to download and self-host.