Built for developers

Build modern websites
faster than ever

A lightweight, modern CSS framework with beautiful components, responsive grid, and SaaS-ready patterns. No dependencies, just pure CSS.

Get Started Free View Examples
Zero dependencies Modern flexbox grid 25+ components
25+ Components
16 Column Grid
1,600+ Lucide Icons
<50kb Gzipped

Why developers choose Amphibious

Everything you need to build beautiful, responsive websites without the bloat

Modern Grid System

16-column flexbox grid with responsive breakpoints. No floats, no clearfixes, just clean modern CSS.

Dark Mode Ready

CSS custom properties make theming a breeze. Switch between light and dark modes with a single class.

25+ Components

Buttons, cards, modals, navigation, forms, and more. All built with semantic HTML and accessibility in mind.

Lightning Fast

Under 50kb gzipped. No JavaScript required for styles. Tree-shakable when you need only specific components.

Accessibility First

WCAG 2.1 compliant. Semantic HTML, ARIA attributes, keyboard navigation, and screen reader support built-in.

E-commerce Ready

Product cards, shopping carts, checkout flows, and rating systems. Perfect for online stores.

How it works

An atomic design system that scales

Amphibious uses Brad Frost's Atomic Design methodology. Start with design tokens, build atoms, combine into molecules, and compose complex organisms. Every component works together seamlessly.

  • Design tokens: colors, typography, spacing foundation
  • Atoms: buttons, badges, icons, spinners
  • Molecules: alerts, progress bars, tooltips
  • Organisms: cards, navigation, modals, forms
Amphibious Component Library
Developer Experience

Built with modern tooling

Powered by Vite 6 for lightning-fast development. TypeScript support, hot module replacement, and optimized production builds out of the box.

  • Vite 6 dev server with instant HMR
  • TypeScript for type-safe JavaScript
  • Biome for linting and formatting
  • CSS custom properties for easy theming
Amphibious Developer Tools

Trusted by developers

Join developers who've made Amphibious their go-to CSS framework

Finally, a CSS framework that doesn't require a PhD to customize. The design tokens make theming incredibly simple. I built our entire dashboard in a weekend."

SC
Sarah Chen Frontend Developer at TechCorp

The atomic design approach is brilliant. Components compose beautifully and the accessibility features are top-notch. Our WCAG audit passed with flying colors."

MR
Michael Rodriguez Lead Designer at StartupX

The e-commerce components saved us weeks of development time. Product cards, carts, checkout flows — all beautifully designed and ready to customize."

Ready to build something amazing?

Get started with Amphibious in minutes. No complex setup, no dependencies, just beautiful components that work.

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Free and open source · MIT License · No credit card required