Modules
Behaviors
Semantic is a development framework that helps create beautiful, responsive layouts using human-friendly 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.
Semantic uses simple phrases called behaviors that trigger functionality.
Any arbitrary decision in a component is included as a setting that developers can modify.
Performance logging lets you track down bottlenecks without digging through stack traces.
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.
3000+ Theming Variables
The only dogma from this framework: everything arbitrary is mutable.
Integration Guide
50+ UI Components
Build your entire site with one UI stack. Share your UI between multiple projects.
3,800+ 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 More Examples
Responsively Designed
Semantic is designed completely with em making reponsive sizing a breeze. Design variations built into elements allow you to make the choice how content adjusts for tablet and mobile.
Partners with Libraries You Love
Semantic has integrations with Angular, Meteor, Ember and many other frameworks to help organize your UI layer alongside your application logic.
Liberate your Development
Build tools, performance logging, support for custom definitions, multiple-levels of theme inheritance—a developer's dream.
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