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Top 8 CSS PostCSS Projects
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In 2025 I started contributing to cssnano, the CSS minifier that runs at the end of a lot of build pipelines. If you use PostCSS, there's a good chance it processes your CSS on every production build. I came for a couple of correctness bugs, and then I stayed for performance.
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Kargo
Stop Scripting Promotions. Start Shipping with Kargo. Kargo automates promotion across dev, staging, and prod with approval gates and verification. Open source, built by the team behind Argo CD. Download now.
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turretcss
Turret is a styles and browser behaviour normalisation framework for rapid development of responsive and accessible websites.
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AppSignal
Monitoring that respects your time & budget. APM, error tracking, and dashboards for modern web apps. Ten-minute setup, transparent flat pricing, and support from engineers who actually use the product.
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
CSS PostCSS discussion
CSS PostCSS related posts
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How I made cssnano ~30% faster
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Fylgja 2.0 is Live
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How to Optimize Website Performance on a Budget
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CSSnano
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Modern CSS Layouts: You Might Not Need a Framework for That
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Cssnano: A modular minifier, built on top of the PostCSS ecosystem
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Old Dogs, New CSS Tricks
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A note from our sponsor - Kargo
akuity.io | 11 Sep 2026
Index
What are some of the best open-source PostCSS projects in CSS? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | cssnano | 4,977 |
| 2 | rfs | 3,365 |
| 3 | postcss-plugins | 1,052 |
| 4 | turretcss | 797 |
| 5 | HiQ | 328 |
| 6 | assembly | 138 |
| 7 | tailpress | 72 |
| 8 | sea.css | 4 |
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