What is Less?

Less is a CSS pre-processor, meaning that it extends the CSS language, adding features that allow variables, mixins, functions and many other techniques that allow you to make CSS that is more maintainable, themable and extendable.

What is PostCSS?

PostCSS is a tool for transforming CSS with JS plugins. These plugins can support variables and mixins, transpile future CSS syntax, inline images, and more.

What is Sass?

Sass is an extension of CSS3, adding nested rules, variables, mixins, selector inheritance, and more. It's translated to well-formatted, standard CSS using the command line tool or a web-framework plugin.

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        What are some alternatives to Less, PostCSS, and Sass?
        CSS 3
        CSS3 is the latest evolution of the Cascading Style Sheets language and aims at extending CSS2.1. It brings a lot of long-awaited novelties, like rounded corners, shadows, gradients, transitions or animations, as well as new layouts like multi-columns, flexible box or grid layouts. Experimental parts are vendor-prefixed and should either be avoided in production environments, or used with extreme caution as both their syntax and semantics can change in the future.
        It is a bunch of cool, fun, and cross-browser animations for you to use in your projects. Great for emphasis, home pages, sliders, and general just-add-water-awesomeness.
        Stylus is a revolutionary new language, providing an efficient, dynamic, and expressive way to generate CSS. Supporting both an indented syntax and regular CSS style.
        The compass core framework is a design-agnostic framework that provides common code that would otherwise be duplicated across other frameworks and extensions.
        Bourbon is a library of pure sass mixins that are designed to be simple and easy to use. No configuration required. The mixins aim to be as vanilla as possible, meaning they should be as close to the original CSS syntax as possible.
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        Decisions about Less, PostCSS, and Sass
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        Reviews of Less, PostCSS, and Sass
        Review ofLessLess

        Absolutely fantastic, not only does it allow for modularity but it is armed with the most useful features like colour operations and nested styles to make you achive more by writing LESS.

        How developers use Less, PostCSS, and Sass
        Avatar of Mick Dekkers
        Mick Dekkers uses PostCSSPostCSS

        PostCSS essentially allows you to set up your own CSS preprocessor with the features that matter to you. It has a modular plugin-based architecture, which means that if someone comes up with a useful new feature, you can easily add it to your stack as a PostCSS plugin. PreCSS and PostCSS-cssnext are some of my go-to plugins.

        Avatar of Kevin Ard
        Kevin Ard uses SassSass

        It was a little awkward building BS3 with LESS, and the rest of the site with SCSS, but it works. SCSS made building the UI elements (ink/flip buttons, img navs, etc) a breeze. It also drives the mobile menu open/close transitions - that would have been much too much with vanilla css.

        Avatar of Tim Lucas
        Tim Lucas uses PostCSSPostCSS

        PostCSS handles compiling node-based CSS libraries, including BassCSS (the whole site is only ~85 lines of custom CSS). It also does auto-vendor-prefixing and support for CSS variables.

        Avatar of Climate CoLab
        Climate CoLab uses SassSass

        Sass helps us write better stylesheets. One major improvement over CSS that we use a lot is variables - it allows for much easier theming to quickly change brand colors for new instances of the xCoLab.

        Avatar of Ujjwal Bhujel
        Ujjwal Bhujel uses SassSass

        When you realise that countless lines of CSS codes could be made countable. And off course, a wonderful and cool way to use the logic behind variables and nesting. Simply love it.

        Avatar of Scrayos UG (haftungsbeschränkt)
        Scrayos UG (haftungsbeschränkt) uses SassSass

        Sass is used as a part of Woltlab Suite Core, which offers to submit/configure own styles via the injection of own Sass-CSS. So we exclusively rely on Sass for our CSS needs.

        Avatar of Refractal
        Refractal uses SassSass

        CSS is a mess. There, we said it. Sass, on the other hand takes CSS and makes it pretty, easy to work with and has stuff like variables which make things seriously awesome.

        Avatar of papaver
        papaver uses LessLess

        love me some less. been less styling for around 3 years. makes working with bootstrap and responsive website a breeze. so much power in the language.

        Avatar of Romans Malinovskis
        Romans Malinovskis uses LessLess
        Avatar of Giovanni Candido da Silva
        Giovanni Candido da Silva uses LessLess

        Customise the UIkit Front-End Framework, because of that is used to create the application CSS. I prefer SASS but is equivalent.

        Avatar of Thibault Maekelbergh
        Thibault Maekelbergh uses PostCSSPostCSS

        We wrote a lot of flexbox and css that needed prefixing. PostCSS + Webpack was the best option here.

        Avatar of BrizTech Ltd.
        BrizTech Ltd. uses LessLess

        CSS Preprocessor, used primarily for variables to ensure brand colour continuity.

        Avatar of CodeBee
        CodeBee uses LessLess

        We use Less to organize our CSS code with imports, variables, mixins, and more.

        Avatar of Virtually(Creative)
        Virtually(Creative) uses PostCSSPostCSS

        Used to minify and extend the CSS markup of the framework.

        Avatar of BookAuthority
        BookAuthority uses PostCSSPostCSS

        We use PostCSS to improve cross-browser compatibility

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