Semantic UI
Semantic UI is a free, open-source front-end framework providing 50+ UI components with natural-language HTML class syntax, jQuery-based behaviors, and 3000+ theming variables. It serves web developers, designers, and teams building responsive websites, distributed under MIT license via GitHub.
- Company typePrivate
- Founded2013
- HeadquartersNew York, United States
- Headcount1–10
- GTM typeB2B
- OfferingSoftware
What Semantic UI does
Semantic UI is an open-source front-end development framework created by Jack Lukic in 2013 and maintained by a small (1-10 employee) team based in New York. The framework provides 50+ UI components organized into five categories (Elements, Collections, Views, Modules, and Behaviors) and uses a natural-language-inspired HTML class syntax intended to make class naming more intuitive than BEM or SMACSS. The technology stack is jQuery-based, with CSS-driven theming supported by 3000+ variables, EM-based responsive sizing, and pre-built theme variations mimicking Amazon, Google Material, GitHub, and Bootstrap aesthetics. Additional behaviors cover API requests, form validation, and viewport-based visibility callbacks.
The framework is distributed free under the MIT license via GitHub, NPM, and Bower, with documentation available in 29 languages. Named production users include Quirky.com and The New Republic, indicating adoption in internet/e-commerce and media/publishing contexts. There is no paid tier, no enterprise version, and no formal GTM motion beyond community-led developer adoption, GitHub distribution, and documentation-driven discovery.
Semantic UI has no disclosed revenue, no funding rounds, no parent company, and no institutional ownership. Sustained development relies on community contributions governed by a Contributor License Agreement and voluntary donations. The latest stable release is version 2.5.0 (2018), and there are no documented product, funding, or commercial activities after that point in the available data.
Semantic UI firmographics
Firmographics- Name
- Semantic UI
- Legal name
- Semantic UI
- Website
- https://semantic-ui.com
- Company type
- Private
- Founded year
- 2013
- Operating status
- Operating
- Headcount range
- 1–10 employees
- Short description
- Semantic UI is a free, open-source front-end framework providing 50+ UI components with natural-language HTML class syntax, jQuery-based behaviors, and 3000+ theming variables. It serves web developers, designers, and teams building responsive websites, distributed under MIT license via GitHub.
- Ownership category
- akta.pro rank
Semantic UI industry classification
Industry- Product category
- Front-end UI Framework
- NAICS
- Information (51)
- SIC
- Services-Prepackaged Software (7372)
- akta.pro primary industry
- Developer Experience Platforms for Enterprise (IDEs, CI/CD, Dev Portals) (HDAEAKAI)
Keywords
Where Semantic UI is headquartered
LocationHeadquarters
- HQ city
- New York
- HQ country
- United States
- HQ region
- North America
Markets served
Semantic UI business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Personnel, Technology or R&D, Infrastructure, Operations
Revenue model
- Open Source / Free Distribution: Semantic UI is a free open source project distributed under the MIT license. The project has no revenue model and operates as a community-driven open source initiative. Support for continued development comes directly from community donations.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Freemium | Others | Free Open Source (MIT License) |
Go-to-market motion1 record
Distribution channels4 records
Marketing channels6 records
Semantic UI product offering
Product offeringCore offering
Semantic UI is an open-source front-end development framework that helps developers create beautiful, responsive web layouts using human-friendly HTML. It uses natural language-inspired class syntax (noun/modifier relationships, word order, plurality) and provides 50+ UI components organized into Elements, Collections, Views, Modules, and Behaviors, along with 3000+ theming variables and pre-built themes (Amazon, Google Material, GitHub, Bootstrap). The framework is distributed free under the MIT license via GitHub, NPM, and Bower.
Product overview
Semantic UI is a free, open-source development framework for creating beautiful, responsive layouts using human-friendly HTML with natural language-inspired class syntax. The framework provides 50+ UI components organized into five categories: Elements (Button, Icon, Input, etc.), Collections (Form, Grid, Menu, Table), Views (Card, Comment, Feed), and Modules (Accordion, Checkbox, Dropdown, Modal, Tab, Transition). Additional modules include API for server communication and Visibility for scroll-based callbacks. The theming system offers 3000+ variables with pre-built themes (Amazon, Google Material, GitHub, Bootstrap) and supports integrations with React, Angular, Meteor, and Ember frameworks. Current version is 2.5.0.
Differentiator
Problem solved
Functional benefit
Products and services
- Semantic UI Framework A free, open-source front-end development framework under the MIT license that helps developers create beautiful, responsive web layouts using human-friendly HTML with natural language-inspired class syntax. Provides 50+ UI components organized into Elements, Collections, Views, Modules, and Behaviors; 3000+ theming variables with pre-built themes (Amazon, Google Material, GitHub, Bootstrap); EM-based responsive sizing; built-in performance debugging; API module for server communication; and form validation with 30+ built-in rules. Integrates with React, Angular, Meteor, and Ember frameworks and is used in production by companies such as Quirky.com and The New Republic. Latest release is version 2.5.0.
Quantifiable outcome
- 5000+ commits on GitHub indicating active development
- +3 more outcomes
Companies that use Semantic UI
Customer profileNamed customers2 records
Segments3 records
Ideal customer profiles3 records
Semantic UI technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- Yes
- API docs
- API detail
Core technology
AI maturity
App detail
Integration4 records
Feature22 records
Semantic UI partnerships and signals
Strategic signalScale indicators6 records
Recent moves6 records
Expansion highlights3 records
Semantic UI competitors and assessment
Company assessmentEmerging players
- Blueprint (Palantir): React-based UI toolkit optimized for building complex, data-dense web interfaces. Comparable as a front-end component library targeting developers building sophisticated web applications.
- Chakra UI: Modern React component library focused on accessibility and developer experience. Comparable as a UI component framework targeting front-end developers, though React-only and newer to market.
Broad incumbents
- Tailwind CSS: Utility-first CSS framework that has become one of the most popular front-end styling tools. While a different paradigm (utility classes vs. semantic components), it competes for the same developer audience and project adoption.
Direct peers
- Bulma: Modern open-source CSS framework based on Flexbox, providing UI building blocks for web developers. Comparable to Semantic UI in target audience, open-source distribution, and CSS-driven component approach.
- PrimeReact: Comprehensive React UI component library with 80+ components and theming support. Comparable in component breadth, theming capabilities, and developer audience to Semantic UI.
- Foundation (Zurb Foundation): Open-source responsive front-end framework offering UI components and a grid system for websites and emails. Directly comparable to Semantic UI in offering, developer audience, and open-source distribution model.
- Material UI (MUI): React component library implementing Google's Material Design system. Comparable as a UI component framework targeting front-end developers, though focused on React and Material Design rather than Semantic UI's natural-language syntax.
- UIKit: Lightweight open-source modular front-end framework with UI components for fast web development. Comparable in target audience, component library approach, and open-source MIT-style licensing.
- Bootstrap (Twitter Bootstrap): The most widely adopted open-source front-end component library, providing CSS/JS components for responsive web development. Directly comparable to Semantic UI in target audience (web developers), distribution (open source via GitHub/NPM), and product category (UI component framework).
- Ant Design: Enterprise-class React UI library with a comprehensive component set and design system. Comparable to Semantic UI in component breadth and theming capabilities, though aimed at React-based enterprise applications.
Market position
Strengths4 records
Weaknesses4 records
Competitive moat3 records
Key risks6 records
Key highlights6 records
Customer concentration
Semantic UI social profiles
Digital presenceSemantic UI financial estimates
Financial estimateRevenue estimate
Valuation estimate
Semantic UI leadership team
Management profileNumber of profiles
Profiles1 record
Semantic UI funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Semantic UI M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Semantic UI
What does Semantic UI do?
Semantic UI is an open-source front-end development framework that helps developers create beautiful, responsive web layouts using human-friendly HTML. It uses natural language-inspired class syntax (noun/modifier relationships, word order, plurality) and provides 50+ UI components organized into Elements, Collections, Views, Modules, and Behaviors, along with 3000+ theming variables and pre-built themes (Amazon, Google Material, GitHub, Bootstrap). The framework is distributed free under the MIT license via GitHub, NPM, and Bower.
Is Semantic UI a public or private company?
Semantic UI is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was Semantic UI founded?
Semantic UI was founded in 2013. It employs 1 to 10 people.
Where is Semantic UI based?
Semantic UI is headquartered in New York, United States, in the North America region.
How does Semantic UI make money?
One revenue line is on record: open Source / Free Distribution.
Who are Semantic UI's main competitors?
Emerging players on record are Blueprint (Palantir) and Chakra UI. Tailwind CSS is listed as a broad incumbent. Direct peers are Bulma, PrimeReact, Foundation (Zurb Foundation), Material UI (MUI), UIKit, Bootstrap (Twitter Bootstrap) and Ant Design.
Does Semantic UI have an API?
Yes. API module allows elements to trigger actions on a server, preserving templated URLs and integrating with UI states. Features include URL templating with required/optional parameters, automatic data routing from UI elements, form serialization, JSON response parsing, success condition testing, and response transformation. Supports state management for loading, error, disabled, and active states. Includes callbacks for request lifecycle (beforeSend, onSuccess, onFailure, onError, onComplete) and allows mocking responses via 'response' and 'responseAsync' settings. Developer documentation is at semantic-ui.com/behaviors/api.html.
What industry is Semantic UI in?
Semantic UI's product category is Front-end UI Framework. Its primary akta.pro industry code is HDAEAKAI, Developer Experience Platforms for Enterprise (IDEs, CI/CD, Dev Portals). Its NAICS code is 51 and its SIC code is 7372.