Tailwind CSS 4 Has a Free Utility Framework: 10x Faster Builds, CSS-First Configuration, and Native Cascade Layers

Tailwind CSS changed frontend styling. But v3 had pain points: JavaScript config files, PostCSS plugin chains, 4-second build times on large projects, and an ever-growing tailwind.config.js . Tailwind CSS 4 rewrites the engine in Rust (Oxide), moves configuration to CSS, and builds in milliseconds. What Changed Feature Tailwind 3 Tailwind 4 Build speed 300-500ms 5-20ms Configuration tailwind.config.js CSS @theme Setup PostCSS + config Import only CSS layers Manual Native @layer Container queries Plugin Built-in Setup (No Config File!) /* app.css — that's the entire setup */ @import "tailwindcss" ; <link href= "app.css" rel= "stylesheet" > No tailwind.config.js . No PostCSS plugin. Just import and use. Theme Customization in CSS @import "tailwindcss" ; @theme { --color-brand : #3498db ; --color-brand-dark : #2980b9 ; --font-display : "Cal Sans" , sans-serif ; --breakpoint-3xl : 1920px ; --spacing-18 : 4.5rem ; } <h1 class= "font-display text-brand text-4xl" > Hello </h1> <div class= "bg