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@csstools

CSS Tools

We help you write your best CSS

Hey there 👋!

GitHub Discussions Discord

We're building CSS Tools to enable you to use the newest features of CSS without having to worry about the browsers you're supporting.

We're doing that with PostCSS which allows us to create plugins that you can use to transform your CSS code so it's compatible with all browsers ✨.

We've created PostCSS Preset Env which packs all of these plugins together and lets you just configure and forget.

You can find the CSS features on cssdb.org which we keep up to date with the state they're, the support they have and some examples and links to get you used to that feature 🤓.

We're available through these channels:

And if you're curious to know what we're working on or how could you contribute, the projects are always a good first stop!

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  1. postcss-plugins postcss-plugins Public

    PostCSS Tools and Plugins

    CSS 1.1k 83

  2. cssdb cssdb Public

    A database of staged CSS features

    JavaScript 549 29

Repositories

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Showing 10 of 120 repositories
  • postcss-plugins Public

    PostCSS Tools and Plugins

    csstools/postcss-plugins's past year of commit activity
    CSS 1,051 MIT-0 83 11 (1 issue needs help) 0 Updated Sep 9, 2026
  • csstools/postcss-plugins-directory's past year of commit activity
    JavaScript 7 MIT 1 0 3 Updated Sep 9, 2026
  • cssdb Public

    A database of staged CSS features

    csstools/cssdb's past year of commit activity
    JavaScript 549 MIT-0 29 0 0 Updated Sep 7, 2026
  • convert-colors Public Forked from jonathantneal/convert-colors

    Convert Colors converts colors between RGB, HEX, HSL, HWB, LAB, LCH, and more

    csstools/convert-colors's past year of commit activity
    JavaScript 0 CC0-1.0 8 0 1 Updated Sep 7, 2026
  • postcss-extend-rule Public

    Use the extend at-rule and functional selectors in CSS

    csstools/postcss-extend-rule's past year of commit activity
    JavaScript 54 CC0-1.0 7 4 1 Updated Sep 3, 2026
  • stylelint-use-logical Public

    Enforce usage of logical properties and values in CSS

    csstools/stylelint-use-logical's past year of commit activity
    JavaScript 74 CC0-1.0 10 6 4 Updated Sep 3, 2026
  • stylelint-media-use-custom-media Public

    Enforce usage of custom media queries in CSS

    csstools/stylelint-media-use-custom-media's past year of commit activity
    JavaScript 17 CC0-1.0 4 0 0 Updated Sep 3, 2026
  • stylelint-value-no-unknown-custom-properties Public

    A stylelint rule to catch usage of unknown custom properties

    csstools/stylelint-value-no-unknown-custom-properties's past year of commit activity
    JavaScript 76 CC0-1.0 34 4 2 Updated Sep 3, 2026
  • stylelint-use-nesting Public

    Enforce nesting when it is possible in CSS

    csstools/stylelint-use-nesting's past year of commit activity
    JavaScript 50 CC0-1.0 12 2 0 Updated Sep 3, 2026
  • postcss-resolve-nested-selector Public

    Resolve a nested selector in a PostCSS AST

    csstools/postcss-resolve-nested-selector's past year of commit activity
    JavaScript 13 MIT 5 0 0 Updated Sep 2, 2026
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