PurifyCSS vs Sass: What are the differences?

Introduction In this article, we will compare the key differences between PurifyCSS and Sass. Both PurifyCSS and Sass are popular tools used in web development for managing and optimizing CSS code. However, they serve different purposes and have unique features that set them apart from each other.

1. Scope of Optimization: PurifyCSS focuses on removing unused CSS selectors from your codebase in order to reduce the overall file size. It analyzes your HTML, JavaScript, and CSS files to determine which CSS selectors are actually used and removes the unnecessary ones. On the other hand, Sass is a CSS preprocessor that allows you to write modular, reusable, and maintainable CSS code. It introduces features like variables, mixins, and nested rules to enhance the overall workflow and efficiency of writing CSS.

2. Dependency: PurifyCSS does not have any external dependencies and can be used as a standalone tool. It can be integrated into your build process or run as a separate task. On the contrary, Sass requires a compiler to convert Sass code into regular CSS. There are several options available for compiling Sass, such as using command-line tools, build systems, or integrating it into your development workflow.

3. Language Syntax: PurifyCSS analyzes CSS code that is written in plain CSS syntax. It does not recognize preprocessors like Sass, Less, or Stylus. On the other hand, Sass introduces its own syntax, known as "Sass syntax", which provides additional features and shortcuts for writing CSS. Sass syntax uses indentation and relies heavily on nesting rules, whereas PurifyCSS does not modify the original syntax.

4. Development Workflow: PurifyCSS is typically used as a post-processing tool that is run after the development phase to remove unused CSS selectors. It can be easily integrated into a build process or run as a separate task to generate a purified CSS file. Conversely, Sass is used during the development phase itself. It allows you to write and organize your CSS code more efficiently by utilizing features like variables, mixins, and partials.

5. Browser Compatibility: Since PurifyCSS only analyzes and removes unused CSS selectors, it does not impact browser compatibility. It works with all modern browsers that support CSS. In comparison, Sass may introduce specific CSS features, such as variables or nested rules, that are not supported by older browsers. However, Sass can be compiled into regular CSS that is compatible with all major browsers.

6. Learning Curve: When transitioning from regular CSS to PurifyCSS, the learning curve is relatively low as it does not require you to learn any new syntax or concepts. It can be integrated into your existing workflow easily. On the other hand, learning Sass syntax and its features may require some time and effort. However, the benefits of using Sass, such as better organization and reusability of CSS code, make it worthwhile for many developers.

In Summary, PurifyCSS is a tool for removing unused CSS selectors in your codebase, while Sass is a CSS preprocessor that introduces advanced features like variables and mixins to enhance the development process. PurifyCSS focuses on optimization, while Sass improves the overall workflow of writing CSS.