UnoCSS

UnoCSS is an instant on-demand Atomic CSS engine designed to provide rapid, customizable styling solutions for modern web development. Unlike traditional CSS frameworks, it operates without parsing, AST, or scanning, making it up to 5 times faster than tools like Windi CSS or Tailwind CSS JIT. Its lightweight footprint (~6kb minified + brotli) ensures minimal impact on performance and browser compatibility. UnoCSS is zero dependencies and highly adaptable, supporting various configurations, presets, transformers, and extractors to suit diverse project needs. Its speed and flexibility make it ideal for developers seeking a joyful and efficient styling experience while maintaining full control over their CSS output. Released under the MIT License and maintained by Anthony Fu, UnoCSS continues to evolve as a powerful tool for modern web development.