Carbon Design System vs GOV.UK Design System
Carbon Design System
carbondesignsystem.com
GOV.UK Design System
design-system.service.gov.ukSide by side
| Figure | Carbon Design System | GOV.UK 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 Frameworks | 8.4 (#2) | 8.0 (#3) |
| Spec score · UI Kit Libraries | 8.4 (#3) | 7.9 (#9) |
| Accessibility | IBM products using Carbon must meet WCAG AA accessibility standards, and the component checklist requires specified color contrast and documented focus flow. | The team describes accessibility work as continuous and iterative, and says using the system alone does not make a service accessible. |
| Audience | Carbon provides code, design, and documentation for designers and developers working across areas including App Modernization, Data and AI, IT Automation, Security, and Finance and Operations. | The team says the Design System is intended for people working on government services, with a focus on central UK government digital services. |
| Components | Carbon components are designed and coded to solve specific UI problems and work together as parts of a larger system. | It provides reusable interface components with usage guidance and coded examples. |
| Patterns | Patterns combine components and design considerations to address user needs; some patterns include example code. | Its patterns offer design solutions for specific user-focused tasks and page types, with written guidance and coded examples where possible. |
| Purpose | Carbon provides reusable assets to help teams build consistent digital experiences faster. | The system helps teams make government services consistent with GOV.UK and learn from research and experience across service teams. |
| Support | Carbon directs users to GitHub issues and provides support by email at [email protected]. | The team focuses support on central UK government digital services and says it cannot reliably provide guidance for different contexts. |
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.
GOV.UK Design System
The GOV.UK Design System helps government teams build services with shared styles, reusable components and patterns for user-focused tasks. Its guidance covers page structure, typography, colour and images; components include coded examples, and patterns address particular tasks and page types. Published guidance includes details about user-research testing. Teams can add GOV.UK Frontend through npm or include compiled files. In production projects, components can be used as HTML or as Nunjucks macros when Frontend is installed with npm and the application uses Node.js. Prototyping requires GOV.UK Prototype Kit version 7 or later. The code is public under the MIT License, and the listed plan is free. The system aims for WCAG level AA compliance, but its use alone does not make a service accessible; component accessibility checks combine tools, automated deployment tests and manual testing. The Government Digital Service maintains the system, with a focus on central UK government digital services. Support may be limited for other contexts. Compiled files include all Frontend CSS and JavaScript, without selective component assets or a customizable build.