CP
Classpresso
Browser Performance Benchmarks
Real tests: 50% faster style recalc • 42% faster First PaintView Report
50% faster style recalculation • 42% faster First Paint

Make Your AI App
Render Faster

Chat UIs, code blocks, markdown — AI apps repeat the same styles thousands of times. Classpresso consolidates them at build time for dramatically faster rendering.

Style Recalc 50% fasterFirst Paint 42% fasterMemory 21% less

Works with Tailwind • Bootstrap • Bulma • Tachyons • UnoCSS • Any utility-first CSS

npm install classpresso
50%
Faster Style Recalc
42%
Faster First Paint
0
Code Changes Required
0
Runtime Overhead
We Drink Our Own Coffee

We're So Confident, We Use It On This Site

classpresso.com is optimized with Classpresso. See the real results — beautiful gauges, comparison charts, and hard numbers.

27%fewer classes
15%faster paint
8%faster layout

Less Classes = Faster Rendering

Every class is work for the browser. Classpresso consolidates repeated patterns so there's less to parse, match, and calculate.

Test Your HTML

Paste your HTML with utility classes to see how much browser work Classpresso can eliminate. Works with Tailwind, Bootstrap, and any utility-first CSS framework.

Your HTML Input—
Consolidated Output—
Enter HTML to see consolidated output

Built for AI App Performance

The real win isn't smaller files — it's faster rendering. AI apps repeat the same styles thousands of times. Consolidation = faster apps.

50% Faster Style Recalc

Chat bubbles, code blocks, cards — AI apps repeat styles thousands of times. Consolidation cuts browser work in half.

42% Faster First Paint

Users see responses sooner. Consolidated classes parse and render dramatically faster.

Zero Code Changes

Runs on your build output, not your source. Your React/Vue/Svelte components stay untouched.

Any Utility Framework

Tailwind, Bootstrap, Bulma, UnoCSS — if it uses utility classes, Classpresso optimizes it.

Simple CLI

One postbuild command. Works with Next.js, Vite, Webpack, or any build tool.

Zero Runtime Cost

Build-time only. No JavaScript added, no runtime overhead. Just optimized HTML + CSS.

Works with all utility-first CSS frameworks

Tailwind CSSBootstrapBulmaTachyonsUnoCSSWindi CSS

"Why not just use @apply?"

Great question. Here's what the Tailwind team actually recommends — and where Classpresso fits in.

"I can say with absolute certainty that if I started Tailwind CSS over from scratch, there would be no @apply. The behavior is outrageously complicated, everyone struggles to build the right mental model of what it's supposed to do, and it encourages bad CSS architecture."
— Adam Wathan, Creator of Tailwind CSS(Aug 2022)

What Tailwind Recommends

Use component abstraction — React, Vue, or Svelte components that encapsulate your UI patterns.

<Button variant="primary">Submit</Button>

This solves code maintainability.

<>

What Actually Renders

The browser still sees all 15 utility classes on every element:

class="_cp-h7"

Browser work is unchanged.

Different Tools, Different Problems

ApproachMaintainabilityPerformanceAutomaticStatus
@apply
CSS directive
Discouraged
Components
React/Vue/Svelte
Recommended
Classpresso
Build-time optimization
N/AComplementary

Use Both. They Solve Different Problems.

Keep using component abstraction for maintainable code. Add Classpresso for faster browser rendering. They're complementary — not competing.

Get StartedView Benchmarks

Simple CLI, Powerful Results

Get started in minutes. Scan, consolidate, and optimize your production build.

Frequently Asked Questions

Everything you need to know about making your AI app render faster.