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20 Most Popular Open-Source UI & CSS Solutions

The world's most-loved open-source UI frameworks and CSS toolkits — with GitHub links, maintainers, star counts and what each one is best at.

By The DevFixPro Editorial Team · independent editorial research project

Star counts retrieved from the GitHub API on 2026-08-17. Open-source projects grow daily, so treat the numbers as a snapshot — always check the linked repository for the latest figures, license, and activity.

Every project eventually needs a UI layer. Rather than hand-rolling buttons and modals from scratch, most teams reach for a battle-tested open-source framework. Below are 20 of the most popular and highly rated open-source UI / CSS solutions, ranked by GitHub stars (fetched 2026-08-17). Each entry links to its GitHub repository so you can read the source, check the license, and judge activity for yourself.

Stars move daily — treat the numbers as a snapshot. For design choices, prefer frameworks that fit your stack (React, Vue, or CSS-only) and that you can actually customize.

  1. 1Tailwind CSS on GitHub
    Tailwind CSS★ 97,225
    By Tailwind Labs (Adam Wathan)

    Utility-first CSS framework for rapid, consistent UI without leaving your HTML.

    View on GitHub →
  2. 2Bootstrap on GitHub
    Bootstrap★ 174,600
    By The Bootstrap Team (Mark Otto & Jacob Thornton)

    The world's most popular HTML, CSS and JS toolkit for responsive, mobile-first sites.

    View on GitHub →
  3. 3Material UI (MUI) on GitHub
    Material UI (MUI)★ 98,845
    By MUI Team

    Comprehensive React component library implementing Google's Material Design.

    View on GitHub →
  4. 4Ant Design on GitHub
    Ant Design★ 99,088
    By Ant Group (AFX Team)

    Enterprise-grade React UI library with a rich set of polished components.

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  5. 5Chakra UI on GitHub
    Chakra UI★ 40,581
    By Segun Adebayo

    Accessible, composable React components with sensible design defaults.

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  6. 6shadcn/ui on GitHub
    shadcn/ui★ 121,468
    By shadcn

    Copy-paste React components built on Radix UI and Tailwind that you own and customize.

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  7. 7Bulma on GitHub
    Bulma★ 50,055
    By Jeremy Thomas

    Modern CSS-only framework based on Flexbox — no JavaScript required.

    View on GitHub →
  8. 8Vuetify on GitHub
    Vuetify★ 41,030
    By John Leider

    Material Design component framework for Vue.js.

    View on GitHub →
  9. 9Element Plus on GitHub
    Element Plus★ 27,675
    By Element Plus Team

    Vue 3 UI library with clean, customizable enterprise components.

    View on GitHub →
  10. 10Quasar on GitHub
    Quasar★ 27,204
    By Razvan Stoenescu

    Vue framework for building SPAs, PWAs, SSR, mobile and desktop apps from one codebase.

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  11. 11PrimeVue on GitHub
    PrimeVue★ 14,466
    By PrimeTek Informatics

    Rich, themeable Vue UI component suite, part of the Prime family.

    View on GitHub →
  12. 12Radix UI on GitHub
    Radix UI★ 19,172
    By WorkOS (Radix Team)

    Unstyled, accessible React primitives for building design systems.

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  13. 13Headless UI on GitHub
    Headless UI★ 28,709
    By Tailwind Labs

    Completely unstyled, accessible UI components for React and Vue.

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  14. 14Mantine on GitHub
    Mantine★ 31,567
    By Vitaly Rtishchev

    Full-featured React components with hooks, theming and dark mode.

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  15. 15NextUI on GitHub
    NextUI★ 30,401
    By NextUI Team (Junior Garcia)

    Beautiful, fast React UI library built on Tailwind CSS and Floating UI.

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  16. 16Flowbite on GitHub
    Flowbite★ 9,318
    By Themesberg (Zoltan Szegyenyi)

    Open-source Tailwind component library with dark mode and Figma files.

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  17. 17daisyUI on GitHub
    daisyUI★ 42,103
    By Pouya Saadeghi

    Tailwind CSS plugin that adds semantic component classes and themes.

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  18. 18Pico CSS on GitHub
    Pico CSS★ 16,787
    By Lucas Larroche

    Minimal CSS framework using semantic HTML as styling — no classes needed.

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  19. 19Semantic UI on GitHub
    Semantic UI★ 51,025
    By Jack Lukic

    UI framework using human-friendly HTML for theming via CSS variables.

    View on GitHub →
  20. 20Foundation on GitHub
    Foundation★ 29,790
    By ZURB / Foundation Team

    Advanced responsive front-end framework with a mobile-first grid.

    View on GitHub →

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