Classpresso

[](https://classpresso.com)

Classpresso

**Make utility-first CSS render faster** — 50% faster style recalculation, 42% faster First Paint

Classpresso consolidates repeated utility class patterns at build time, dramatically reducing browser rendering work. Works with Tailwind, Bootstrap, Bulma, Tachyons, UnoCSS, and any utility-first CSS framework.

**📦 Post-Build Tool — Your Development Workflow is Unchanged**

Classpresso runs **after** your build (`npm run build`), not during development. Your source code is never modified — only the compiled output in `.next`, `dist`, `build`, etc. You'll always see your normal Tailwind/utility classes while developing and debugging.

Performance Results

Metric	Improvement
Style Recalculation	50% faster
First Paint	42% faster
Memory Usage	21% less
Runtime Overhead	0ms

*Benchmarks run on 1000 complex components with Playwright + Chrome DevTools Protocol*

The Problem

Utility-first CSS means elements with 10-20+ classes:

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**Every class on every element is work for the browser:**

• Parse the class string
• Look up each class in stylesheets
• Calculate specificity and resolve conflicts
• Compute final styles

With 15 classes × 500 elements = **7,500 class lookups per page load**.

The Solution

Classpresso finds repeated patterns and consolidates them:

**Before:**

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