postcss

PostCSS

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

PostCSS is used by industry leaders including Wikipedia, Twitter, Alibaba, and JetBrains. The Autoprefixer and Stylelint PostCSS plugins are some of the most popular CSS tools.

  PostCSS is built by Evil Martians, an American design and engineering consultancy for developer tools, AI, and cybersecurity startups.

Docs

Read full docs here.

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sass

Sass is a mature, stable, and powerful professional grade CSS extension language. It provides mechanisms such as variables, nesting, and mixins, which are not present in standard CSS. Unlike PostCSS, which uses JavaScript plugins, Sass has its own syntax and compiles to standard CSS.

less

Less is a backward-compatible language extension for CSS. It also allows variables, mixins, functions and many other techniques that allow you to make CSS more maintainable and extendable. Less is similar to Sass and differs from PostCSS in that it offers a different syntax and set of features.

stylus

Stylus is a preprocessor that serves as a more robust and feature-rich alternative to CSS. It supports both an indented syntax and regular CSS style. Stylus provides significant flexibility and feature parity with Sass and Less but with a different syntax and feature set compared to PostCSS.