CWV & SEO Inspector

Live Core Web Vitals + full technical/on-page SEO audit, key-free field data, and a robots.txt & page-compare analyzer.

CWV & SEO Inspector shows you exactly how the page you're looking at is performing and whether it's built the way search engines (and increasingly, AI answer engines) expect — right in your browser, with no account and no API key. CORE WEB VITALS • LCP, CLS, INP, FCP, and TTFB measured in real time as you browse • INP computed the same way Chrome/CrUX do — tracking the longest interactions and estimating a true high-percentile value, not a naive max • A breakdown of what's driving your LCP: server response time, resource load delay, resource load time, and render delay TECHNICAL SEO • Title, meta description, canonical, robots meta, hreflang, and viewport checks, including duplicate-tag detection • Heading hierarchy and duplicate/missing H1 detection, with a one-click "show me on the page" for flagged elements • Open Graph and Twitter Card tags • JSON-LD structured data parsing with required-field validation for common types (Article, Product, FAQPage, HowTo, Recipe, and more) • Redirect chain tracing, HTTP header inspection (X-Robots-Tag, CSP, HSTS, cache headers), broken-link checking, sitemap.xml validation, and mixed-content detection • Full robots.txt analyzer with per-crawler testing (Googlebot, Bingbot, GPTBot, and more) — multiple user-agent groups, wildcards, and end-anchors CONTENT & AI-READINESS • Readability scoring and keyword density • FAQPage/HowTo schema and paragraph-length checks that correlate with getting cited by AI answer engines like ChatGPT and Perplexity • An llms.txt checker for the emerging convention some sites are adopting FIELD & LAB DATA — NO API KEY • Pulls real 28-day Chrome UX Report field data and a full Lighthouse lab report from Google's public PageSpeed Insights endpoint, with no key required from you • A guaranteed fallback link to Google's own hosted report if the shared quota is ever busy PRO TOOLS • View the page as Googlebot, Bingbot, or GPTBot to check for cloaking or crawler-specific blocks • Compare two URLs side by side • Export any report as JSON or CSV Nothing here requires an account, a subscription, or an API key. Every request goes straight from your browser to the site you're inspecting or to Google's public endpoints — see the privacy policy for details.