Knowledge Base

Website Performance & SEO Guides

Free, practical guides for shipping faster, more accessible, better-ranked websites.

Accessibility Checker

Check your website's accessibility for free. Get a Lighthouse accessibility score covering contrast, alt text, ARIA, keyboard navigation, and more — with clear next steps.

Best Practices Checker

Check your website for modern web best practices — HTTPS, security headers, console errors, deprecated APIs, and more — using Google Lighthouse.

Core Web Vitals Checker

Check your Core Web Vitals (LCP, CLS, INP) on any URL for free. Get instant Google Lighthouse results with traffic-light thresholds and clear fix recommendations.

Desktop Speed Test

Run a free desktop Lighthouse audit on any URL. Get Performance, SEO, Accessibility, Best Practices scores and Core Web Vitals — instantly.

How Google Rates Websites

Inside how Google actually measures website quality: Lighthouse, Core Web Vitals, PageSpeed Insights, and the Page Experience signal. Plain English explanation.

How to Improve Website Speed

Step-by-step guide to making your website faster. Twelve high-impact fixes ranked by effort vs reward, with real numbers and code examples — no fluff.

Mobile Speed Test

Test your website's mobile speed for free. Get Lighthouse scores, Core Web Vitals, and a prioritized fix list for the mobile experience Google actually uses to rank you.

SEO Score Checker

Check your website's SEO score for free using Google's Lighthouse engine. Get instant feedback on titles, meta descriptions, structured data, mobile-friendliness and more.

Website Speed Test

Run a free website speed test on any URL. Get mobile and desktop Lighthouse scores, Core Web Vitals, and a plain-English breakdown in 30 seconds.

Why Is My Website Slow?

If your website feels slow, it's almost always one of seven things. Diagnose the real cause in 30 seconds with a free Lighthouse audit, then fix it.