Semantic UI
Semantic empowers designers and developers by creating a shared vocabulary for UI.
About Semantic UI
Semantic UI is an open-source front-end development framework for building responsive website layouts using HTML classes based on natural-language conventions (noun/modifier relationships, word order, plurality). It provides over 50 UI components spanning elements, collections, views, modules, and behaviors, including buttons, forms, grids, menus, modals, dropdowns, accordions, and progress indicators, along with a theming system built on more than 3,000 variables that allows components to be restyled via variable and override files. It includes a JavaScript layer using "behaviors" (settings-driven functions) to control component interactivity, plus built-in performance/debug logging for tracking animation and transition bottlenecks.
The framework integrates with React, Angular, Meteor, and Ember, and sizing is built with em units to support responsive behavior across tablet and mobile viewports. It is released under the MIT license, with development supported through community contributions and donations. Documentation covers build tools, theming, layout recipes, and API references for individual components, and the project maintains translations into multiple languages through a community translation tool.
It is aimed at front-end developers and teams building websites or web applications who want a full component library and theming system rather than assembling individual UI pieces, and who need framework-level integration with JavaScript libraries such as React or Angular.
Key features
- 50+ UI components spanning elements, collections, views, modules, and behaviors
- 3000+ theming variables with multi-level theme inheritance for full design customization
- Human-friendly HTML class syntax based on natural-language noun/modifier relationships
- JavaScript behaviors with configurable settings for each component
- Built-in performance/debug logging for tracking down UI bottlenecks
- Responsive layouts built with em-based sizing for tablet and mobile
Frequently asked questions
Is Semantic UI free to use?
Yes, Semantic UI is free and open source under the MIT license.
What frameworks does it integrate with?
Semantic UI integrates with React, Angular, Meteor, and Ember, among other frameworks.
How many components does it provide?
It provides 50+ UI components covering elements, collections, views, modules, and behaviors.
Can I customize the look and feel?
Yes, Semantic UI includes 3000+ theming variables and an inheritance system with variable and override files for complete design control.
Is the project actively maintained?
It has over 5000 commits and is used in multiple large-scale production environments.
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