FAQ

Yes — completely. Every scan runs directly from your browser against Google's public PageSpeed Insights API. There's no signup, no subscription, and no limit on how many sites you can check.

Core Web Vitals are three metrics Google uses to measure real-world page experience:

• LCP (Largest Contentful Paint) — how long the main content takes to load.
• CLS (Cumulative Layout Shift) — how much the page jumps around while loading.
• TBT / INP (Total Blocking Time / Interaction to Next Paint) — how quickly the page responds to clicks and taps.

The scores come straight from Google Lighthouse — the same engine behind PageSpeed Insights and the Lighthouse panel in Chrome DevTools. They reflect a single simulated page load ("lab data"), which is great for spotting issues but can differ from the real-world ("field") data Google uses for ranking, which is based on actual visitor traffic over time.

Lighthouse loads the page fresh every time, and small variations in network conditions, server response time, ads, or third-party scripts can shift the numbers by a few points. If you see a big swing, run it again — and try to fix issues that show up consistently across multiple scans.

No. WebAnalyzer works entirely in the browser tab you're using right now. Just type a web address and click "Generate report."

No. The request is sent directly from your browser to Google's PageSpeed Insights API — we don't operate a server in between, and we don't log, save, or share the addresses you check. See our Privacy Policy for full details.

WebAnalyzer and PageSpeed Insights both use Lighthouse, so scores should be very close — minor differences come from natural run-to-run variance. Search Console's Core Web Vitals report uses real visitor (field) data collected over 28 days, which is a different measurement entirely and won't match a single lab scan exactly.

You can run a report on any public website address. The scan only reads publicly available page data — the same information Google's own crawlers and tools can see.

After making changes to your site — a new theme, plugin, image, or hosting change — is a good time to check. Otherwise, a monthly check is enough to catch slow drift in performance or SEO health.