Boost your website performance by extracting above-the-fold CSS with our advanced critical CSS generator. Perfect for developers and agencies.
Built by developers, for developers. Extract critical CSS with precision and speed.
Extract critical CSS in under 50ms. Our optimized engine processes websites faster than any competitor.
Advanced viewport detection ensures 100% accurate above-the-fold CSS extraction for any device.
REST API, webhooks, batch processing, and CLI tools. Integrate seamlessly into your workflow.
Generate critical CSS for mobile, tablet, and desktop viewports simultaneously.
SOC2 compliant with enterprise-grade security. Your data is protected at all times.
Detailed reports showing performance gains, file size reduction, and optimization metrics.
Enter any website URL and extract above-the-fold CSS in seconds
Improve your Core Web Vitals and search rankings with optimized above-the-fold CSS extraction
Critical CSS extraction directly improves your Largest Contentful Paint (LCP) and Cumulative Layout Shift (CLS) scores.
Google uses page speed as a ranking factor. Our critical CSS generator helps you achieve better SEO performance.
Average improvement with critical CSS optimization
Integrate critical CSS extraction into your build process with our powerful REST API
Simple HTTP endpoints for critical CSS extraction
Get notified when extraction is complete
Process multiple URLs simultaneously
Command line interface for automation
Our advanced algorithm analyzes your website and extracts only the CSS needed for above-the-fold content
Our system fetches and analyzes your webpage structure, identifying all CSS resources
We simulate different device viewports to determine what content appears above the fold
Advanced algorithms extract only the CSS rules needed for above-the-fold rendering
The extracted CSS is minified and optimized for maximum performance gains
Start free, scale as you grow. No hidden fees, no surprise charges.