Frameworks Using Less

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UI/Theme Frameworks and Components

1pxdeep Brings designing by relative visual weight, or designing with color schemes, to Bootstrap
Ant Design An enterprise-class UI design language and React-based implementation.
Bootflat Open source Flat UI KIT based on Bootstrap
BootPress A PHP Framework with a built in Blog and Flat File CMS
Bootstrap Front-end framework for developing responsive, mobile first projects on the web
Bootstrap a11y theme Makes web accessibility easier for Bootstrap developers
Bootswatch Collection of free themes for Bootstrap
Cardinal Small "mobile first" CSS framework for front-end developers who build responsive web applications
CSSHórus Library for development of responsive and mobile websites
Flat UI Free Theme and framework for Bootstrap
frontsize CSS front end framework
InContent Image content with description created with CSS
Ink set of tools for quick development of web interfaces
JBST Theme framework that can be used as a standalone website builder or to create WordPress themes
KNACSS Minimalist, responsive and extensible style sheet to kick-start your HTML / CSS projects
Kube Minimalistic CSS-framework for developers and designers
Metro UI CSS Set of styles to create a site with an interface similar to Windows 8
Pre CSS framework
prelude Lightweight, responsive and extensible front-end framework
Schema Light, responsive, and lean frontend UI framework
Semantic UI UI component framework based around useful principles from natural language
UIkit Lightweight and modular front-end framework for developing web interfaces
ngBoilerplate An opinionated kickstarter for AngularJS projects
less-rail Less.js for Rails
Wee Lightweight front-end framework for logically building complex, responsive web projects

Grid Systems

Flexible Grid System
Golden Grid System
Less Zen Grid
Responsive Boilerplate

Mixin Libraries

3L Mixins library
animate Library of CSS3 keyframe animations
Clearless Collection of mixins
Css3LessPlease Conversion of to Less mixins
CssEffects Collection of CSS style effects
Cssowl Mixin library
cube.less Animated 3D cube using only CSS
est Mixin library
Hexagon Generate CSS hexagons with custom size and color
homeless Mixin library
Less Elements Set of mixins
Less Hat Mixins library
lessley A jasmine like testing suite written in pure less
Lessmore Mixins library. Cross-browser support for the CSS3 features and more
LESS-bidi Set of mixins for creating bi-directional styling
LESS-Mix Mixins library
media-query-to-type Media Queries to Media Types with Less
More-Colors.less Variables for easier color manipulation while you design in the browser
more-less Mixin lib supporting Less 1.7
More.less Mixins, animations, shapes and more
more-or-less for-loops and other functions + css3 mixins
normalize.less Modularized famous normalize.css using less
Oban Collection of mixins
Preboot Collection of variables and mixins. The precursor to Bootstrap
prelude-mixins Collection of mixins
Shape.LESS Collection of mixins for various shapes
tRRtoolbelt.less Mixins and functions for common actions

Editors and Editor Plugins

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Also see: GUIs for Less.js

Editors and IDEs

Sublime Text 2 & 3


Komodo Edit/IDE

Visual Studio


Notepad++ 6.x

Less.js Plugins

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Available Less plugins. Find more at the NPM Registry


sass2less Convert SASS to LESS or import SASS files into your .less files and re-use varialbes, mixins and more

Postprocessor / Feature Plugins

Autoprefixer Add vendor prefixes
CSScomb Beautify/format
clean-css Compress/minify
CSSWring Compress/minify
css-flip Generate left-to-right (LTR) or right-to-left (RTL) CSS
functions Write custom Less functions in Less itself
glob Globbing support in Less imports
group-css-media-queries Group CSS media queries
inline-urls Convert url() to a call to data-uri()
lesshint Lint your Less
npm-import Import from npm packages
pleeease Postprocess using pleeease
rtl Reverse from ltr to rtl

Function Libraries

advanced-color-functions Some advanced colour functions that helps in finding more contrasting
cubehelix cubehelix(y,a,b,t) function returns a color between the two colors a and b, using a gamma correction value of 1
lists Lists/arrays manipulation functions library

Framework/Library Importers

Note: many of these are no longer necessary since Less.js can import NPM-installed libraries since v3.0.

Bootstrap import Bootstrap
Bower Resolve import from a Bower package
Cardinal CSS for less.js import Cardinal
Flexbox Grid import Flexbox Grid
Flexible Grid System import Flexible Grid System
Ionic import Ionic
Lesshat import Lesshat
Skeleton import Skeleton

GUIs for Less

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Tip: try out the different Less tools available for your platform to see which one meets your needs.

This page focuses on GUI compilers. For command line usage and tools see Command Line Usage.

Cross platform

Crunch 2!

The editor and compiler for awesome people.

Crunch 2 is a cross-platform (Windows, Mac, and Linux) editor with integrated compiling. If you work with large Less projects, you should definitely try it out, as you only need the free version for Less files. Available at:

Crunch screenshot


SimpLess is a minimalistic Less compiler. Just drag, drop and compile.

One of the unique features of SimpLess is that it supports 'prefixing' your CSS by using SimpLess is built on the Titanium platform. Get more info:

SimpLess screenshot


Koala is a cross-platform GUI application for compiling less, sass and coffeescript.

Features: cross platform, compile error notification supports and compile options supports.

Get more info:

koala screenshot


Prepros is a tool to compile LESS, Sass, Compass, Stylus, Jade and much more.

Get more info at

Prepros screenshot

Specific platforms



WinLess started out as a clone of, it takes a more feature-complete approach and has several settings. It also supports starting with command line arguments.

Get more info:

WinLess screenshot



CodeKit is the successor to, and supports Less among many other preprocessing languages, such as SASS, Jade, Markdown, and many more.

Get more info:

CodeKit screenshot


CSS edits and image changes apply live. CoffeeScript, SASS, Less and others just work.

Get more info:

LiveReload screenshot



Plessc is a gui fronted made with PyQT.

Auto compile, log viewer, open the less file with the editor chosen, settings for compile the file. Get more info:

Plessc screenshot

Online Less Compilers

Edit the markdown source for "online-less-compilers" Online Integrated Development Environment (IDE) that is hosted in a browser allowing users to edit and compile Less to CSS in real-time. This Online Less Compiler can help you to learn Less. You can go through the examples below or try your own Less code. Online compiler for Less CSS. A simple Less CSS file converter using the Less JS project. less.php live demo. lessphp live demo.
precess A real time preprocesser compiler.
estFiddle Online Less compiler providing live demo for Less and est. Allowing users to switch among all versions of Less after 1.4.0 with optional est/Autoprefixer functionalities.
ILess Live demo of ILess PHP compiler
BeautifyTools Less Compiler Online Less compiler with optional formatting and minification at BeautifyTools

Online Web IDEs/Playgrounds with Less support

CSSDeck Labs CSSDeck Labs is a place where you can quickly create some experiments (or testcases) that involves HTML, CSS, JS code.
CodePen CodePen is a playground for the front end side of the web.
Fiddle Salad An online playground with an instantly ready coding environment.
JS Bin JS Bin is a webapp specifically designed to help JavaScript and CSS folk test snippets of code.
jsFiddle Online Web Editor

Third Party Compilers

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Node.js Compilers

  • grunt-contrib-less
  • assemble-less: Full-featured Grunt.js plugin for compiling Less files to CSS, with additional options for maintaining libraries of Less components and themes. For advanced users, this plugin allows you to define and manage Less "packages" or "bundles" using JSON, Lo-dash(underscore) templates (e.g. <%= bootstrap.less %>), and node-glob / minimatch (e.g. '../src/**/*.less"). assemble-less also has a number of options including minifying CSS
  • gulp-less: Please note that this plugin discards source-map options, opting to instead using the gulp-sourcemaps library.
  • autoless: A Less files watcher, with dependency tracking (changes to imported files cause other files to be updated too) and growl notifications.
  • Connect Middleware for Less.js: Connect Middleware for Less.js compiling

Other Technologies

Wro4j Runner CLI Download the wro4j-runner.jar file and run the following command:

java -jar wro4j-runner-1.5.0-jar-with-dependencies.jar --preProcessors lessCss

More details can be found here: Wro4j Runner CLI

CSS::LESSp styles.less > styles.css

Windows Script Host

Note - the official Less node runs on windows, so we are not sure why you would use this.

Less.js for Windows with this usage:

cscript //nologo lessc.wsf input.less [output.css] [-compress]


lessc input.less [output.css] [-compress]


dotless for Windows can be run like this:

dotless.Compiler.exe [-switches] <inputfile> [outputfile]

Also see:

Ports of Less.js

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Know of another port that should be added to this list? Please let us know.