Top 12 Open-Source Alternatives to Flat UI Pro

Product categories

CSS Framework CSS Tools Components Library Design Tools Developer Tools Development Tools Javascript UI Libraries UI UI Design Website Design

Summary

The top open-source alternatives to Flat UI Pro are Bootstrap, Bulma, and Tailwind CSS. One of the criteria for ordering this list is the number of mentions that products have on reliable external sources. You can suggest additional sources through the form here.

Bootstrap Landing Page
1

Bootstrap

Simple and flexible HTML, CSS, and JS for popular UI components and interactions
Pricing:
- Open Source
#CSS Framework #Development Tools #Design Tools 326 social mentions
Bulma Landing Page
2

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.
Pricing:
- Open Source
#CSS Framework #Development Tools #Design Tools 109 social mentions
Tailwind CSS Landing Page
3

Tailwind CSS

A utility-first CSS framework for rapidly building custom user interfaces.
Pricing:
- Open Source
#Developer Tools #Design Tools #Website Design 868 social mentions
UIKit Landing Page
4

UIKit

A lightweight and modular front-end framework for developing fast and powerful web interfaces
Pricing:
- Open Source
#CSS Framework #Development Tools #Design Tools 20 social mentions
Materialize CSS Landing Page
5

Materialize CSS

A modern responsive front-end framework based on Material Design
Pricing:
- Open Source
#CSS Framework #Development Tools #Design Tools 25 social mentions
Semantic UI Landing Page
6

Semantic UI

A UI Component library implemented using a set of specifications designed around natural language
Pricing:
- Open Source
#CSS Framework #Design Tools #Development Tools 17 social mentions
HTML5 Boilerplate Landing Page
7

HTML5 Boilerplate

A rock-solid default for HTML5 awesome.
Pricing:
- Open Source
#CSS Framework #Design Tools #Development Tools 17 social mentions
Purecss Landing Page
8

Purecss

A set of small, responsive CSS modules that you can use in every web project.
Pricing:
- Open Source
#CSS Framework #Development Tools #Javascript UI Libraries 8 social mentions
Metro UI CSS Landing Page
9

Metro UI CSS

Metro UI CSS a set of styles to create a site with an interface similar to Windows 8.
Pricing:
- Open Source
#CSS Framework #Design Tools #Developer Tools
MUI Landing Page
10

MUI

MUI is a lightweight HTML/CSS/JS framework that follows Google's Material Design guidelines
Pricing:
- Open Source
#CSS Framework #Development Tools #Design Tools
Skeleton CSS Landing Page
11

Skeleton CSS

A Beautiful Boilerplate for Responsive, Mobile-Friendly Development
Pricing:
- Open Source
#CSS Framework #CSS Tools #Design Tools 17 social mentions
Element UI Landing Page
12

Element UI

A Desktop UI Library. Element, a Vue 2.0 based component library for developers, designers and product managers.
Pricing:
- Open Source
#UI Design #UI #Components Library 1 social mentions