Semantic UI

A UI Component library implemented using a set of specifications designed around natural language

16 Alternatives To Semantic UI

Angular Material

Angular Material is both a UI Component framework and a reference implementation of Google’s Material Design Specification.
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Bootstrap

Simple and flexible HTML, CSS, and JS for popular UI components and interactions
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Bulma

Bulma is an open source CSS framework based on Flexbox and built with Sass. It’s 100% responsive, fully modular, and available for free.

Element UI

Element, a Vue 2.0 based component library for developers, designers and product managers.
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Foundation

The most advanced responsive front-end framework in the world
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Gridlex

Simple. Robust. Responsive. Flexible.

GroundworkCSS

Responsive HTML5, CSS and JavaScript Framework

HTML5 Boilerplate

A rock-solid default for HTML5 awesome.
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Material-UI

A CSS Framework and a Set of React Components that Implement Google’s Material Design
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Purecss

A set of small, responsive CSS modules that you can use in every web project.

Spectre

Spectre is a web application to diff screenshots.
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UIKit

A lightweight and modular front-end framework for developing fast and powerful web interfaces
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Vuetify

Material Component Framework for VueJS 2
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Webix UI

An enterprise JavaScript Library for cross-platform app development with HTML5 JavaScript widgets and easy integration with most popular JavaScript Frameworks.

w2ui

W2UI is a small JavaScript UI library with a complete set of widgets: layout, grid, sidebar, toolbar, tabs, fields, popup, utilities.