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Power Tools For The Web

npm version
Build Status

Susy is a design-agnostic set of tools for creating powerful, custom layouts. We didn't want another grid system full of rules and restrictions — we wanted a power tool for building our own damn systems. Version Three is trimmed down to it's most basic components — functions that can be used to build any grid system.


"I like the idea of grids-on-demand, rather than a strict framework."
– Chris Coyier, CSS Tricks

"Susy and Zendesk have been getting along magically… It’s precisely what you need and nothing more."
— Stephany Varga, Zendesk

"If you’re interested in reading Sass poetry, be sure to look at Susy’s source code!"
— Hugo Giraudel, SitePoint


Third-Party Tools


npm install susy

There are two imports to choose from. The default sass/susy comes with un-prefixed versions of the core API functions. If you want Susy to be name-spaced, import sass/susy-prefix instead.

// un-prefixed functions
@import '<path-to>/susy/sass/susy';

// susy-prefixed functions
@import '<path-to>/susy/sass/susy-prefix';

Using Eyeglass

With eyeglass set up, you can @import 'susy'; without providing the npm-modules path.

Using Webpack

Make sure sass-loader is installed:

npm install sass-loader --save-dev

Make sure you have sass-loader enabled in your webpack configuration:

// webpack.config.js
module: {
  rules: [
      test: /\.scss$/,
      use: ['style-loader', 'css-loader', 'sass-loader']

Start using Susy:

/* app.scss */
@import "~susy/sass/susy";

Using Gulp

Add a gulp task:

// gulpfile.js
gulp.task('sass', function() {
  return gulp.src('scss/*.scss')
          outputStyle: 'compressed',
          includePaths: ['node_modules/susy/sass']
      }).on('error', sass.logError))

Start using Susy:

/* app.scss */
@import 'susy';

Using Grunt (and Yeoman)

To add Susy to the Sass task, edit your Gruntfile.js at the root level of your project and look for the Sass-related rules. Add require: 'susy' inside the options object:

// Gruntfile.js
sass: {
  dist: {
    options: {
      style: 'expanded',
      require: 'susy'
    files: {
      'css/style.css': 'scss/style.scss'

Assuming you’ve already installed Susy, it will now be added to the project and will not clash with Yeoman's grunt rules.

Start using Susy:

/* app.scss */
@import 'susy';

Susy vs Su

You may notice that some functions have a susy- prefix, while others only have su-. This helps distinguish between the two distinct layers:

  • The core grid-math layer is called Su, and is made up of "pure" functions that expect normalized values. This is useful if you prefer argument-syntax to shorthand syntax, or if you are building your own Susy mixins.
  • The upper Susy layer provides syntax-sugar – global defaults, shorthand-parsing, normalization, and a smaller set of common-use functions that call on the core math as necessary. This is the primary API for most users.
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