Semantic UIUser Interface is the language of the web

Get StartedNew in 2.4

Design Beautiful Websites Quickly

Semantic is a development framework that helps create beautiful, responsive layouts using human-friendly HTML.

Concise HTML

Semantic UI treats words and classes as exchangeable concepts.

Classes use syntax from natural languages like noun/modifier relationships, word order, and plurality to link concepts intuitively.

Get the same benefits as BEM or SMACSS, but without the tedium.

<div class="ui three buttons"><button class="ui active button">One</button><button class="ui button">Two</button><button class="ui button">Three</button></div>

Intuitive Javascript

Semantic uses simple phrases called behaviors that trigger functionality.

Any arbitrary decision in a component is included as a setting that developers can modify.

Run Code
$('select.dropdown') .dropdown('set selected', ['meteor', 'ember']) ;
<select name="skills" multiple="" class="ui fluid dropdown"><option value="">Skills</option><option value="angular">Angular</option><option value="css">CSS</option><option value="ember">Ember</option><option value="html">HTML</option><option value="javascript">Javascript</option><option value="meteor">Meteor</option><option value="node">NodeJS</option></select>

Simplified Debugging

Performance logging lets you track down bottlenecks without digging through stack traces.

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Run Code
$(<span class="string">'.sequenced.images .image'</span>)
    debug     : <span class="literal">true</span>,
    animation : <span class="string">'jiggle'</span>,
    duration  : <span class="number">500</span>,
    interval  : <span class="number">200</span>

Unbelievable Theming

Semantic comes equipped with an intuitive inheritance system and high level theming variables that let you have complete design freedom.

Develop your UI once, then deploy with the same code everywhere.

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Variable File

Override File

3000+ Theming Variables

The only dogma from this framework: everything arbitrary is mutable.

Theming Guide

50+ UI Components

Build your entire site with one UI stack. Share your UI between multiple projects.

Browse UI

5000+ Commits

Semantic UI is a free open source project already used in multiple large scale production environments.

Visit GitHub

Unbelievable Breadth

Definitions aren't limited to just buttons on a page. Semantic's components allow several distinct types of definitions: elements, collections, views, modules and behaviors which cover the gamut of interface design.

See Layout Examples



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Responsively Designed

Semantic is designed completely with em making responsive sizing a breeze. Design variations built into elements allow you to make the choice how content adjusts for tablet and mobile.

Responsive Examples

Partners with Libraries You Love

Semantic has integrations with React, Angular, Meteor, Ember and many other frameworks to help organize your UI layer alongside your application logic.

See Integrations

Liberate your Development

Enterprise Ready

Build tools, performance logging, support for custom definitions, multiple-levels of theme inheritance—a developer's dream.

Get Started Now