18 Best CSS Libraries/Frameworks for UI/UX Designs 2024

The CSS Selection - 2026 Edition - Project Wallace

The CSS Selection shows real-world CSS usage from over 100,000 websites and looks at the most important metrics.

2026 CSS wishlist – Nathan Knowler

What I’d like to see prioritized for CSS in 2026, how those features will allow us to create better web-based design systems, and how they renew separation of concerns.

tailwindcss - npmx

A utility-first CSS framework for rapidly building custom user interfaces.

WebTUI

Modular CSS Library that brings the beauty of Terminal UIs to the browser

98.css

A design system for building faithful recreations of old UIs.

Modern CSS snippets. Every old hack, replaced.

Side-by-side comparisons of outdated CSS techniques and their modern native replacements. Grid, custom properties, nesting, container queries, and more.

Modern CSS snippets. Every old hack, replaced.

Side-by-side comparisons of outdated CSS techniques and their modern native replacements. Grid, custom properties, nesting, container queries, and more.

tailwindlabs/tailwindcss

A utility-first CSS framework for rapid UI development.

CSS selectors - CSS | MDN

The CSS selectors module defines the patterns to select elements to which a set of CSS rules are then applied along with their specificity. The CSS selectors module provides us with more than 60 selectors and five combinators. Other modules provide additional pseudo-class selectors and pseudo-elements.

Open Props UI | A modern CSS UI library

CSS UI library leveraging the most modern features. Components you can copy and paste into your project.

Vanilla CSS is all you need

Campfire, Writebook, and Fizzy show that modern vanilla CSS can power serious apps without Sass, PostCSS, or a build step.

XP.css

A design system for building faithful recreations of old UIs.

7.css

A design system for building faithful recreations of the Windows 7 UI.

I Built the Same App 10 Times: Evaluating Frameworks for Mobile Performance | Loren Stewart

I needed to choose a framework for a mobile-first app at work. I started comparing Next.js, SolidStart, and SvelteKit, then expanded to 10 frameworks. The measurements revealed dramatic differences in bundle sizes, performance, and the real cost of framework choices.

Building a UI framework

Building a UI Framework Ian Hickson (ian@hixie.ch) — 2025 — First Edition — https://software.hixie.ch/ui-frameworksTo leave comments, use the edit version. Introduction This document examines important design decisions for creating a new graphical UI framework. It was commissioned to answer the...