Sass vs Less: A Comprehensive Comparison

sass vs less

With the advent of CSS preprocessors, developers have found it easier to construct and manage CSS files. Among these preprocessors, two of the most popular are Sass and Less. But which one should you use for your projects?

In this article, we will delve into a detailed comparison between Sass and Less, helping you understand their pros, cons, and key differences.

What are Sass and Less?

Before we compare the two, let’s define what each of them is.

Sass, which stands for Syntactically Awesome Stylesheets, is an extension of CSS that adds power and elegance to the basic language. It allows for the use of variables, nested rules, mixins, inline imports, inheritance, and more, all with a fully CSS-compatible syntax.

Less, on the other hand, stands for Leaner Style Sheets. It’s a backward-compatible language extension for CSS, much like Sass, and offers similar features. Its main selling point is its simplicity and ease of use.


The syntax for Less is more similar to CSS than Sass. However, Sass comes in two syntaxes: the newer “SCSS” (Sassy CSS) syntax that closely resembles standard CSS, and the older, more concise “indented” syntax.

Here’s how you define a variable in both:


$font-size: 14px;


@font-size: 14px;


Both Sass and Less provide similar features like variables, mixins, functions and operations, nesting, and importing other files. However, Sass has a few more advanced features, including:

  • Control directives for libraries.
  • Advanced functions for manipulating colors and other values.

Community and Support

Sass, being older, has a larger community and therefore, more plugins and frameworks. Popular projects built with Sass include Compass, Bourbon, and Susy.

Less has fewer resources available, but it does include a couple of significant ones, such as LessHat and Preboot.

Compatibility and Usage

Less runs on both the client-side (Chrome, Firefox, Safari, Internet Explorer) and server-side with Node.js and Rhino. This could be a significant advantage for developers who prefer or require client-side compilation.

Sass runs on Ruby, but LibSass (a C/C++ port of the Sass engine) allows Sass to be run on many platforms and languages, including Node.js, Ruby, and Python.


In the end, the choice between Sass and Less comes down to personal preference and project requirements. Both offer powerful tools that can make writing CSS easier and more efficient.

If you’re just starting out with a CSS preprocessor, Less might be easier to pick up, given its simpler syntax and the ability to run client-side. However, if you need more advanced features, larger community support, or compatibility with many platforms, then Sass might be the better choice.

Remember, there’s no “one size fits all” solution in the world of web development. Experiment with both Sass and Less and find which one suits your workflow best.






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