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Less
Less

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Less vs Sass: What are the differences?

What is Less? The dynamic stylesheet language. 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 Sass? Syntactically Awesome Style Sheets. 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.

Less and Sass can be categorized as "CSS Pre-processors / Extensions" tools.

"Better than css", "Variables" and "Mixins" are the key factors why developers consider Less; whereas "Variables", "Mixins" and "Nested rules" are the primary reasons why Sass is favored.

Less and Sass are both open source tools. It seems that Less with 16K GitHub stars and 3.46K forks on GitHub has more adoption than Sass with 12K GitHub stars and 1.93K GitHub forks.

According to the StackShare community, Sass has a broader approval, being mentioned in 2082 company stacks & 1445 developers stacks; compared to Less, which is listed in 496 company stacks and 168 developer stacks.

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 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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Why do developers choose Less?
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      What companies use Less?
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      What are some alternatives to Less 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.
      Animate.css
      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.
      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.
      Stylus
      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.
      Compass
      The compass core framework is a design-agnostic framework that provides common code that would otherwise be duplicated across other frameworks and extensions.
      See all alternatives
      Decisions about Less and Sass
      React
      React
      GraphQL
      GraphQL
      Apollo
      Apollo
      JavaScript
      JavaScript
      TypeScript
      TypeScript
      Webpack
      Webpack
      React Helmet
      React Helmet
      styled-components
      styled-components
      Sass
      Sass
      Less
      Less
      PostCSS
      PostCSS
      Bootstrap
      Bootstrap
      Semantic UI
      Semantic UI
      Foundation
      Foundation
      React Router
      React Router
      Koa
      Koa
      #JSX
      #React.
      #Css
      #StyledComponents.
      #Async
      #HTML
      #GraphQL
      #Apollo

      ReactQL is a React + GraphQL front-end starter kit. #JSX is a natural way to think about building UI, and it renders to pure #HTML in the browser and on the server, making it trivial to build server-rendered Single Page Apps. GraphQL via Apollo was chosen for the data layer; #GraphQL makes it simple to request just the data your app needs, and #Apollo takes care of communicating with your API (written in any language; doesn't have to be JavaScript!), caching, and rendering to #React.

      ReactQL is written in TypeScript to provide full types/Intellisense, and pick up hard-to-diagnose goofs that might later show up at runtime. React makes heavy use of Webpack 4 to handle transforming your code to an optimised client-side bundle, and in throws back just enough code needed for the initial render, while seamlessly handling import statements asynchronously as needed, making the payload your user downloads ultimately much smaller than trying to do it by hand.

      React Helmet was chosen to handle <head> content, because it works universally, making it easy to throw back the correct <title> and other tags on the initial render, as well as inject new tags for subsequent client-side views.

      styled-components, Sass, Less and PostCSS were added to give developers a choice of whether to build styles purely in React / JavaScript, or whether to defer to a #css #preprocessor. This is especially useful for interop with UI frameworks like Bootstrap, Semantic UI, Foundation, etc - ReactQL lets you mix and match #css and renders to both a static .css file during bundling as well as generates per-page <style> tags when using #StyledComponents.

      React Router handles routing, because it works both on the server and in the client. ReactQL customises it further by capturing non-200 responses on the server, redirecting or throwing back custom 404 pages as needed.

      Koa is the web server that handles all incoming HTTP requests, because it's fast (TTFB < 5ms, even after fully rendering React), and its natively #async, making it easy to async/await inside routes and middleware.

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      Hampton Catlin
      Hampton Catlin
      VP of Engineering at Rent The Runway | 4 upvotes 182.1K views
      atRent the RunwayRent the Runway
      Sass
      Sass
      PostCSS
      PostCSS
      styled-components
      styled-components

      We use Sass because I invented it! No, that's not a joke at all! Well, let me explain. So, we used Sass before I started at Rent the Runway because it's the de-facto industry standard for pre-compiled and pre-processed CSS. We do also use PostCSS for stuff like vendor prefixing and various transformations, but Sass (specifically SCSS) is the main developer-focused language for describing our styling. Some internal apps use styled-components and @Aphrodite, but our main website is allllll Sassy. Oh, but the non-joking part is the inventing part. /shrug

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      Interest over time
      Reviews of Less 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 and Sass
      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 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 (haftungsbeschr盲nkt)
      Scrayos UG (haftungsbeschr盲nkt) 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 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.

      How much does Less cost?
      How much does Sass cost?
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