Bootstrap 5 vs Bulma — Which CSS Framework to Use in 2026

Bulma came out in 2016 and had a genuine moment. It was the Flexbox-first alternative to Bootstrap at a time when Bootstrap was still on a mixed Flexbox/grid model. Clean class names, no JavaScript dependency, readable markup. I tried it on a project back then.

Here's where things stand now.

What Bulma Does Well

Bulma's class naming is arguably more readable than Bootstrap's. Compare:

Copy
<!-- Bulma -->
<div class="columns">
  <div class="column is-4">Sidebar</div>
  <div class="column is-8">Content</div>
</div>

<!-- Bootstrap -->
<div class="row">
  <div class="col-md-4">Sidebar</div>
  <div class="col-md-8">Content</div>
</div>

is-4 is more natural English than col-md-4. That's genuinely nicer.

Bulma is also pure CSS — no JavaScript at all. If you want zero JS dependency, Bulma delivers that. Bootstrap requires its JS bundle for modals, dropdowns and other interactive components.

Bulma's modifier system is consistent. is-primary, is-large, is-rounded — these modifiers apply across all components the same way.

Where Bootstrap Wins

Component library breadth. Bootstrap ships with 30+ ready-to-use components including modals, off-canvas panels, toast notifications, carousels, tooltips and more — all with working JavaScript. Bulma's component library is smaller and you provide your own JavaScript.

Ecosystem. Bootstrap has years of community components, themes, templates and Stack Overflow answers. Bulma's ecosystem is a fraction of that size.

Maintenance. Bootstrap is backed by a team. Bulma is maintained by one person, Jeremy Thomas, who does great work but has limited bandwidth. Bootstrap 5.3 added dark mode, CSS variables, color mode support — Bulma hasn't had equivalent updates.

JavaScript integration. Bootstrap's JS works with Angular, React and Vue either directly or via wrapper libraries. Bulma leaves this entirely to you.

Documentation. Bootstrap's docs are comprehensive, searchable and kept current. Bulma's docs are clear but not updated as frequently.

The JavaScript Question

This is the biggest practical difference.

If you need modals, you have to build them yourself with Bulma. If you need a dropdown that opens on click with keyboard navigation, you build it. If you need toast notifications, you build them.

With Bootstrap you get all of this for free. The tradeoff is a JS dependency — but bootstrap.bundle.min.js is ~60KB gzipped, which is not a meaningful bundle size concern for most projects.

Who Should Use Bulma

Bulma makes sense if:

• You specifically want a CSS-only framework
• You're comfortable writing your own JavaScript for interactive components
• You like the is-* modifier naming convention
• Your project is relatively simple and doesn't need the full Bootstrap component set

My Take

Bulma was the right choice for specific projects in 2017. In 2026 the gap has widened. Bootstrap 5 added dark mode, CSS custom properties, and improved utilities. Bulma's pace of development hasn't matched that.

If you want a lightweight CSS framework without JavaScript, Bulma is still decent. If you want a complete framework with components, ecosystem and active maintenance, Bootstrap 5 wins clearly.

I haven't chosen Bulma over Bootstrap on a project since 2018. The component coverage difference is just too significant.