Bootstrap vs Foundation vs Bulma vs Semantic vs UIkit

Each CSS framework is tested. This post covers the origins of each framework and its top features. It also includes a quick start guide for each framework.

At the end of this post, you will know the top features and limitations of each framework and be in a better position to identify which of them best suits your needs. Let’s get started:

Bootstrap (getbootstrap.com)

Bootstrap is a responsive, mobile-first CSS framework to develop websites quickly. It is the most popular CSS framework on this list by GitHub stars, and by a wide margin. Bootstrap contains ready-to-use components developed with HTML, CSS and JavaScript.

Bootstrap was created at Twitter in mid-2010 and released publicly on August 19, 2011, and it eventually evolved into an independent project. The current stable version is 5.3.8, and Bootstrap 6 is in public alpha. Bootstrap 5 dropped jQuery for regular JavaScript and removed support for older browsers.

To use Bootstrap, you have to do the following when building a new web page:

• Use the HTML5 doctype
• Create a viewport meta tag
• Import the Bootstrap CSS in your head tag
• Import the bootstrap.bundle.min.js script, which includes Popper, before the closing body tag to use any of Bootstrap’s JavaScript functionalities; jQuery is no longer required

Here is a starter template.

Some of these templates use CDN-hosted resources, while the Foundation and Semantic templates load local files from their starter downloads or builds instead. Here is a quick start guide on Bootstrap.

In addition to a robust mobile-first approach, there is significant community support owing to the maturity of the framework. The official Bootstrap Themes marketplace has been sunset. Here is our pick of free UI kits for Bootstrap. In addition to being mobile first, there is some support for touchscreens. As Bootstrap is a mature project, it supports many accessibility features.

The biggest drawback of Bootstrap is the increase in page weight. While a few hundred kilobytes may not seem significant when the median home page now weighs about 2.7 MB according to the HTTP Archive Web Almanac, it may concern developers who aim for the highest efficiency.

Bootstrap should be your go-to option if you are looking for a stable platform with a good support base. It is the right choice if you do not wish to tinker much with the default components. Bootstrap is perfect for those who want to quickly iterate solutions in an agile environment.

Foundation (get.foundation)

The broad steps to use Foundation on your website are as follows:

• Download the Foundation starter template
• Use the HTML5 doctype
• Add the Foundation CSS file in the head tag
• Include jQuery, what-input.js and Foundation’s scripts
• Just before ending the body tag, call the foundation() function to attach the Foundation properties to various DOM elements

Here is a quick-start template:

You can also install Foundation with npm install foundation-sites or load version 6.9.0 from the jsDelivr CDN, as described in the Foundation installation docs.

When we try to compare Bootstrap and Foundation, a couple of things come up. Bootstrap has far more GitHub stars than Foundation, 174k+ to 29k+. Foundation, on the other hand, hands you control over your components through its Sass settings and the option to customize a build to include or remove elements. Foundation for Sites 6 now receives bug fixes only while its successor, Yeti 7, is in alpha, but it still provides many accessibility features.

The functionality between Bootstrap and Foundation does not change significantly, and you won’t lose much when choosing either platform. That being said, you should probably go with Foundation if you want more control over your project.

You may also be interested in:

• 25+ Best React UI Component Libraries / Frameworks for 2026
• 10+ Best JavaScript Animation Libraries to Use in 2026

Bulma (bulma.io)

In order to use Bulma in your project, you have to follow these steps:

• Add the HTML5 doctype
• Add a meta tag for a responsive viewport
• Include the Bulma CSS file in your head tag
• [Optional] Add the fontawesome script to use icons

Here’s a template:

Bulma has a more gentle learning curve. A significant difference of Bulma’s with respect to Bootstrap and Foundation is the sole focus on CSS, without any JavaScript elements in the framework. The exclusion of JavaScript means Bulma ships no script payload, although its full minified CSS file is larger than Bootstrap’s, so importing only the modules you need pays off. In terms of accessibility, Bulma is only partially accessible.

As a developer, you should opt for Bulma if you would like a CSS-only framework with no JavaScript that helps you create responsive elements for the web. There is considerable support for the framework to help you if you get stuck in the process.

Semantic (semantic-ui.com)

To use Semantic components in your project, you need to complete the following steps:

• Include the HTML5 doctype
• Load the Semantic CSS file
• Include jQuery before calling any JavaScript elements
• Include Semantic’s script

Here’s a template:

To compare Semantic the others, you would notice that in spite of intuitive naming conventions, Semantic falls short in terms of complexity to learn. The documentation is extensive, but it takes some time to get used to. Integration with JavaScript frameworks like Angular and React is good, which makes it ideal for use in an application that involves the use of these frameworks.

Semantic is the framework that has a relatively easier learning curve, and supports JavaScript frameworks too. If your requirements involve the use of JavaScript, look at Fomantic-UI, the actively maintained community fork of Semantic UI, since the original project’s last release was 2.5.0 in October 2022.

UIkit (getuikit.com)

To use UIkit components in your project, you need to complete the following steps:

• Include the HTML5 doctype
• Load the UIkit CSS file
• Include UIkit’s scripts for functionality and icons

Here’s a template:

UIkit has a significant number of features if we’re comparing it with Bootstrap, Foundation or Bulma. UIkit is not the lighter pick: its full minified CSS, JavaScript and icons together outweigh Bootstrap’s CSS and JavaScript bundle. It definitely stands neck to neck with these frameworks in terms of quickly iterating versions of your web applications in an agile development environment.

While UIkit gives you a lot of freedom in terms of control over structure and features, its community is smaller than Bootstrap’s, so you may find fewer answers online if you run into issues with the framework. Therefore, you should consider this framework in a project only if your front-end programming skills are advanced enough.

Final thoughts

To summarize what we’ve talked about in this comparison of the top CSS frameworks:

• If you want a hassle-free solution that has a lot of support, go for Bootstrap
• To get more freedom on your components, try out Foundation
• If you want a CSS-only framework, give Bulma a try, and if you want modular components with their own JavaScript, try UIkit
• If your web application uses heavy JavaScript frameworks, look at Fomantic-UI, the maintained fork of Semantic UI

Which CSS framework do you use in 2026? Do let us know in the comments below!

Layout, presentation, and editing by Karol K.