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twbs/bootstrap

The most popular HTML, CSS, and JavaScript framework for developing responsive, mobile first projects on the web.

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Summary Information

Updated 2 hours ago
Type:FrameworkCategory(s):CSS Frameworks & StylingUI Components & Design SystemsWeb Development
Added to GitGenius on July 5th, 2023
Created on July 29th, 2011
Open Issues & Pull Requests: 230 (+2)
GitHub issues: Enabled
Number of forks: 78,544
Total Stargazers: 174,805 (-1)
Total Subscribers: 6,615 (+0)

Repository Insights (GitGenius)

Median issue/PR response: 8.3 days
Mean response time: 483.4 days
90th percentile: 1607.0 days
Tracked items: 1,060

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Maintainer activity

3 people did triage or write work on this repository in the last 12 months.

Counts unlabeled, assigned, unassigned, milestoned, demilestoned, locked, unlocked over the last 12 months. These are issue and pull request events that require triage or write permission. Commits and code review are not counted. labeled and renamed are excluded because GitHub issue forms record the issue author as the actor. Figures from October 7, 2026. This count is not comparable across projects: each project's automation decides which of these events a person emits.

How this project is maintained

About 6% of issues opened in the past year have never received a reply. 93% of open issues come from outside the core team, so the backlog reflects real-world use rather than internal planning. Work labelled "confirmed" is answered fastest, typically in about 2 days, while "feature" waits about 6 months. 84% of issues opened in the past year have been closed, leaving a working backlog. Three people close 92% of everything that gets resolved.

Charts & Analytics

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Issue Activity (beta)

Open issues: 112
New in 7 days: 4
Closed in 7 days: 2
Avg open age: 672 days
Stale 30+ days: 100
Stale 90+ days: 82

Recent activity

Opened in 7 days: 4
Closed in 7 days: 2
Comments in 7 days: 5
Events in 7 days: 11

Top labels

  • css (4,872)
  • v4 (3,063)
  • js (2,203)
  • feature (1,738)
  • docs (1,291)
  • v5 (1,273)
  • confirmed (854)
  • has-pr (639)

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Detailed Description

Bootstrap is the most widely adopted HTML, CSS, and JavaScript framework for building responsive, mobile-first web projects. The framework provides developers with a comprehensive toolkit including utility classes, a grid system, pre-built UI components, JavaScript plugins, and responsive design patterns that enable faster web development without sacrificing customization.

The repository's primary language is MDX, and it serves as the source for both the framework code and its documentation, which is built with Astro and hosted at getbootstrap.com. Bootstrap 5 is the current development focus on the default branch, with Bootstrap 4 maintained separately on the v4-dev branch. The framework is distributed through multiple package managers including npm, yarn, Bun, Composer, and NuGet, making it accessible to developers across different technology stacks. Downloads include compiled and minified CSS and JavaScript files, source maps for debugging, and bundled JavaScript that incorporates Popper for positioning utilities.

Activity tracking reveals sustained engagement with the project.

The framework emphasizes mobile-first responsive design, providing a foundation for building websites and applications that work seamlessly across devices. Its component library includes buttons, forms, navigation, cards, modals, and numerous other UI elements that developers can use as building blocks. The CSS is built with Sass, allowing for variable customization and extension. JavaScript plugins add interactivity to components like dropdowns, tooltips, popovers, and carousels.

Bootstrap maintains comprehensive documentation with search functionality powered by Algolia's DocSearch. The project follows semantic versioning and provides previous release documentation at getbootstrap.com/docs/versions/. Contributing guidelines are clearly documented, requiring JavaScript patches to include unit tests and all code to conform to the Code Guide maintained by Mark Otto. The community extends beyond GitHub through official channels including X, a blog, GitHub Discussions, Discord, a subreddit, and IRC, providing multiple avenues for users to seek help and engage with maintainers and fellow developers.