The open-source design tool
for creatives

Build custom design tools without writing any code. Create responsive components, pages, and sites that you can use in any type of web project. Style markup templates with curated themes or your own design tokens.

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Visually design custom design tools, generative components, pages, and sites


🎨 Theme

Import or define design tokens to use in all of your designs. Dedicated tools for creating accessible color systems, responsive type scales, layered box shadows, and more.



Generative styles + markdown

Syntax highlighting

Customize the look of your code examples

Color scales

Scale-based palette generator


Preview colors against common UI


A growing set of generative components for UI and graphic design.


Cycle through generated designs or create your own from scratch with the ease of parametric controls.


Manipulate parameters until the design is just right. Lock inputs for properties or combinations of properties you like to find your visual language.


Vote generated designs up or down to curate future output. Save as many iterations as you want.

Multi-format export

Export designs in a growing list of formats including: React, JS, JSON, JSX, SVG, PNG, HTML, CSS, CSS custom properties, and Sass.

One-click publish

Instantly share your designs with colleagues or clients to present or collaborate. Publish hosted web pages along with hosted assets for styles as JS, JSON, and CSS.

Constraint-based designs

Design with scales and systems. Components automatically use your defined brand guidelines, retaining the ability to override with custom values at any time.

Theme import

Start using your visual brand immediately. Audit and edit or use to drive constraints for generative components.

Automated accessibility docs

Rapid visual feedback loops for contrast scores and accessible combinations available in a theme.

Responsive themes

Don't just design for a single screen size. Easily target values across your defined breakpoints. Manage responsive typography, layout, and spacing.

1000+ fonts

Full support for the entire Google Font Library + any fonts you have installed locally.

Variable font support

The first design tool with full support for variable fonts. Automatically exposes all custom axis so you can get the fine-grained control variable fonts were meant to enable.

Curated design assets

Browse curated presets to customize or use in your designs.

Used by thousands of creatives at places like

Pentagram (design firm) logo


A gallery of responsive components that are easy to customize

Random image

Card link

A basic card component that takes an image, title, text, and kicker content.

Random image

Card link 5

A soft card with soft interactions

Space image

Card link 7

A soft card with bold typography

BadgeBadge outlineText GradientsAa Bb Cc Dd Ee Ff Gg Hh Ii Jj Kk Ll Mm Nn Oo Pp Qq Rr Ss Tt Uu Vv Ww Xx Yy Zz
View more

Theme import

Create a theme from your existing website's visual brand. We'll parse your CSS for colors, typography, motion, shadows, and spacing values to use as design tokens.


Modular scales for color, typography, shadows, and motion, optimized for designing digital interfaces. Easy to modify or extend to fit your brand. Export as CSS, Custom properties, JS, JSON, or Sass to use in any type of web project.

LCH - Natural

156 colors

7,768 accessible combinations


Workflows powered by generative design

{ css.gui }
CSS.GUIA growing collection of open source visual editors for CSS.Read more
Year One ReviewDevelopments and highlights over the past year.Read more
An Interview with Elliot Jay StocksOn creative process, running a label, and designing album covers with
Components AI.
Read more
Generative Logo DesignA brief walkthrough of the thinking and process behind the design of our generative logo.Read more
Computational Theming: ColorAn introduction to computational methods to ensure your designs are visually accessible.Read more

Learn CSS

Use Studio to explore interactive and editable examples that you can use to rapidly learn how CSS works for each property.

background-image: gradients

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