dart-sass

Built on the optimized Dart VM, Dart Sass compiles stylesheets significantly faster than Ruby Sass, with performance benchmarks detailed in the repository's perf.md file.

As the primary implementation that replaced Ruby Sass, it is the standard for Sass language compliance and receives active updates, ensuring long-term reliability.

Installable via npm, standalone binaries, package managers like Homebrew and Chocolatey, and Docker, making it accessible in virtually any development or production environment.

Supports all core Sass features like variables, nesting, mixins, modules, and control directives, enabling maintainable and dynamic stylesheets as highlighted in the key features.