Bootstrap vs Bulma
Which should you use? A side-by-side look at what each one does, who it suits, what it costs, how hard it is to set up, and where each falls short.
Open source · MIT
A free front-end toolkit of ready-made CSS and JavaScript for building responsive websites.
Open source · MIT
A CSS framework built on Flexbox that gives you styled layout and UI classes.
Our verdict
Bootstrap and Bulma both give you free, ready-made styling for web pages, but they differ in scope. Bootstrap ships CSS plus JavaScript for interactive pieces like menus and popups, so it covers more out of the box. Bulma is CSS-only, leaving scripting to you, which suits developers who already have their own JavaScript and want a lighter style layer.
Pick Bootstrap if you want a complete toolkit with ready-made interactive components and a common design system for building responsive sites quickly.
Pick Bulma if you already have your own JavaScript and only need a flexible, Flexbox-based styling layer that you can customize with Sass variables.
| Key difference | Bootstrap | Bulma |
|---|---|---|
| Scope | CSS and JavaScript components for layout and interactivity | CSS only; no JavaScript, so you add your own scripts |
| Output | Compiled and minified CSS and JS, plus source maps | A single CSS file, customizable through Sass |
| Look | Recognizable default style; less suited to a fully custom identity | Much of the appearance is meant to be customized |
| Browser support | Not described in the provided information | Recent major browsers; IE 10+ only partially supported |
| Community and activity | About 175k GitHub stars; code updated in the last day | About 50k GitHub stars; last code update 39 days ago |
Written with AI from both products' catalogue entries · updated 2026-10-29
Who each one is for
Choose Bootstrap if you need…
- Developers building responsive websites or web app interfaces quickly
- Teams that want a common design system with ready-made components
- Developers who prefer installing via npm, yarn, Bun, or a direct download
- Projects that need both LTR and RTL layouts, since the README says CSS supports both
Choose Bulma if you need…
- Developers who want a quick, consistent styling baseline for a web page
- Projects that already have their own JavaScript and only need a style layer
- Teams that want to customize styles through Sass variables
- Developers working with Vue, React, or other frameworks who want Bulma-based component libraries
Side-by-side
| Bootstrap | Bulma | |
|---|---|---|
| Type | Library | Library |
| Price | Free and open source | Free and open source |
| Licence | MIT | MIT |
| GitHub stars | 175k | 50k |
| Setup difficulty | Beginner | Beginner |
| How you get it | Install with a package manager | Install with a package manager |
| Main language | MDX | CSS |
| Last code update | 4 days ago | 46 days ago |
What each one is
Bootstrap
Bootstrap is a collection of HTML, CSS, and JavaScript code that gives web pages a consistent look and layout that adapts to different screen sizes. It is used by web developers who want to build interfaces faster instead of writing styles and interactive components from scratch. The README describes it as a front-end framework and points to a documentation site for details.
Bulma
Bulma is a CSS framework based on Flexbox. It ships as a single CSS file with ready-made classes for layout and common interface elements, so you can style a web page without writing much custom CSS. It contains no JavaScript, so you add your own scripts for any interactive behavior.
Best for
Bootstrap
- Developers building responsive websites or web app interfaces quickly
- Teams that want a common design system with ready-made components
- Developers who prefer installing via npm, yarn, Bun, or a direct download
- Projects that need both LTR and RTL layouts, since the README says CSS supports both
Bulma
- Developers who want a quick, consistent styling baseline for a web page
- Projects that already have their own JavaScript and only need a style layer
- Teams that want to customize styles through Sass variables
- Developers working with Vue, React, or other frameworks who want Bulma-based component libraries
Strengths
Bootstrap
- Widely used, with the README reporting about 175,000 stars on GitHub
- Provides both compiled and minified CSS and JS files plus source maps for debugging
- Released under the MIT license, which permits commercial use
Bulma
- Based on Flexbox, with a single CSS file as its output
- No JavaScript included, so it does not force a particular JS environment
- Customizable through Sass source files and variables
Not ideal for
Bootstrap
- Projects that want a highly custom visual identity without a default look, since the framework provides a recognizable base style
- Developers who need the latest stable release today, since the default branch is for Bootstrap 6 alpha development and the README directs Bootstrap 5 users to the v5-dev branch
- Non-developers looking for a no-code website builder, since it requires editing HTML and CSS
Bulma
- People who need interactive components like modals or dropdowns out of the box, since Bulma has no JavaScript and you must supply it
- Projects that must support Internet Explorer fully, since the README says IE 10+ is only partially supported
- Teams that want a heavily opinionated design system with a fixed look, since much of the appearance is meant to be customized
Trade-offs
Bootstrap
- The default branch is currently a Bootstrap 6 alpha, so the README's quick start pins a pre-release version (6.0.0-alpha.1)
- The README does not describe component details in depth; it points to external documentation for that
Bulma
- Browser support is limited to recent versions of major browsers, with only partial support for IE 10+
- Interactive behavior must be written or added separately
- The README notes the project is in constant development, so details may change between releases
Getting started
Bootstrap
Install with npm (pre-release version shown in README)
npm install bootstrap@6.0.0-alpha.1Clone the repository
git clone https://github.com/twbs/bootstrap.gitBulma
Install with npm
npm install bulmaInstall with Yarn
yarn add bulmaFrequently asked questions
Should I use Bootstrap or Bulma?
Bootstrap and Bulma both give you free, ready-made styling for web pages, but they differ in scope. Bootstrap ships CSS plus JavaScript for interactive pieces like menus and popups, so it covers more out of the box. Bulma is CSS-only, leaving scripting to you, which suits developers who already have their own JavaScript and want a lighter style layer. Pick Bootstrap if you want a complete toolkit with ready-made interactive components and a common design system for building responsive sites quickly. Pick Bulma if you already have your own JavaScript and only need a flexible, Flexbox-based styling layer that you can customize with Sass variables.
What is the difference between Bootstrap and Bulma?
Bootstrap: A free front-end toolkit of ready-made CSS and JavaScript for building responsive websites. Bulma: A CSS framework built on Flexbox that gives you styled layout and UI classes. Bootstrap suits developers building responsive websites or web app interfaces quickly, while Bulma suits developers who want a quick, consistent styling baseline for a web page.
Are Bootstrap and Bulma free?
Bootstrap: Free and open source. Bulma: Free and open source.
Is Bootstrap or Bulma more popular?
Bootstrap has more GitHub stars (175k) than Bulma (50k). Popularity isn't the same as fit — check which one matches your use case above.
What are other alternatives to Bootstrap and Bulma?
Other options people compare them with include Tailwind CSS, Materialize, Tabler, NES.css, Bootswatch.
Keep comparing
Built from our catalogue entries for both products: open-source details come from each project's README (AI-assisted, refreshed weekly) and GitHub data; AI-tool details are editorial. Spotted something wrong? Let us know from either product's page.