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Head-to-head · UI Kit Libraries

Carbon Design System vs GitHub Primer

  • Updated Oct 2026
  • Both researched from official sources
  • 4 checks side by side
Higher score Carbon Design System #2 in UI Kit Libraries 9.2/10 Free plan Free plan✓ 3 of 3 features Visit Carbon
GitHub Primer #4 in UI Kit Libraries 8.8/10 Open source ✓ 3 of 3 features Visit GitHub Primer

Carbon Design System leads on 0 checks, GitHub Primer on 0, and 4 are even. Who comes out ahead on the 4 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreCarbon Design System · 9.2/10
  • Free planonly Carbon Design System

Carbon Design System scores higher on our rubric for ui kit libraries: 9.2 against 8.8 out of 10; our editors rank them #2 and #4.

On primary asset format, Carbon Design System gives you Multiple where GitHub Primer offers Figma.

Carbon Design System is the better fit for open-source teams needing broad UI coverage. GitHub Primer is the better fit for teams building product interfaces with React.

  • Carbon Design System fits best

    Open-source teams needing broad UI coverage

  • GitHub Primer fits best

    Teams building product interfaces with React

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature Carbon Design System 9.2/10 Visit ↗ GitHub Primer 8.8/10 Visit ↗
At a glance
Editor score 9.2 8.8
Ranking #2 in UI Kit Libraries #4 in UI Kit Libraries
Best for Open-source teams needing broad UI coverage Teams building product interfaces with React
Pricing model Free Free
Starting price Free plan Open source
Free plan ✓ (best) Not checked yet
Free trial — —
Deployment Cloud Cloud
Platforms Web Web
Support Email, Docs, Community Community, Docs
Built for Small business, Mid-market, Enterprise Mid-market, Enterprise
Features Carbon Design System 3/3 · GitHub Primer 3/3
Design-system ready ✓ ✓
Responsive components ✓ ✓
Accessibility guidance ✓ ✓
Specs
Component count Not checked yet Not checked yet
Primary asset format Multiple Figma
License scope Commercial Not checked yet
Our review
Pros
  • Free, open-source system with commercial use permitted
  • React, Web Components, Angular, Vue, and Svelte implementations
  • Detailed accessibility guidance, verification, and screen-reader status
  • Broad coverage across navigation, forms, overlays, layouts, and text input
  • Figma libraries, design tokens, themes, and Octicons support consistent design
  • React, CSS, responsive behavior, and accessibility guidance are included
Cons
  • Figma kit access is limited to IBM’s private Figma organization
  • Broad coverage may exceed the needs of narrowly focused projects
  • Web is the listed platform, without broader platform coverage
  • Its visual direction is closely aligned with GitHub-style product interfaces
  • The CSS repository is in KTLO mode, with Primer React recommended instead
  • Its implementation focus is web-based rather than cross-platform
Our verdict

Carbon Design System is IBM’s open-source design system for teams building websites and digital products. It brings together reusable coded components, design-tool kits, tokens, themes, styles, grids, icons, pictograms, and guidance for…

Read the review →

GitHub Primer is an open-source design system for product and design teams building consistent web interfaces with a GitHub-style visual direction. It combines Figma libraries for Primer Web, Primer Primitives, and Octicons with reusable…

Read the review →
  1. Carbon Design SystemUI Kit Libraries 9.2Free plan
  2. GitHub PrimerUI Kit Libraries 8.8Open source

Strengths and trade-offs

  • Carbon Design System — where it wins

    • Free, open-source system with commercial use permitted
    • React, Web Components, Angular, Vue, and Svelte implementations
    • Detailed accessibility guidance, verification, and screen-reader status

    Where it doesn't

    • Figma kit access is limited to IBM’s private Figma organization
    • Broad coverage may exceed the needs of narrowly focused projects
    • Web is the listed platform, without broader platform coverage

  • GitHub Primer — where it wins

    • Broad coverage across navigation, forms, overlays, layouts, and text input
    • Figma libraries, design tokens, themes, and Octicons support consistent design
    • React, CSS, responsive behavior, and accessibility guidance are included

    Where it doesn't

    • Its visual direction is closely aligned with GitHub-style product interfaces
    • The CSS repository is in KTLO mode, with Primer React recommended instead
    • Its implementation focus is web-based rather than cross-platform
  • Carbon Design System9.2/10 · Free plan

    A broad, accessible UI system with coded components, design kits, tokens, and framework options.

    Visit CarbonFull verdict →
  • GitHub Primer8.8/10 · Open source

    An open-source UI system with broad components, tokens, Figma libraries, and React support.

    Visit GitHub PrimerFull verdict →

More comparisons

All UI kit libraries comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update