Web Vitals

Complete website analysis in one popup: Core Web Vitals, SEO & indexability, accessibility, DNS, server info and tech stack.

Web Vitals — Complete website analysis in a single popup. Measure Core Web Vitals, run SEO and indexability audits, check accessibility, inspect server and DNS details, and detect the technology stack of any website. All analysis runs locally in your browser. WEB VITALS Real-time LCP, CLS, INP, FCP and TTFB metrics with color-coded ratings (good / needs improvement / poor). Comparison against real-user field data from the Chrome UX Report (CrUX), plus specific fix suggestions for every metric that fails its threshold. SEO & INDEXABILITY SEO score 0-100 based on title, meta description, headings, images, structured data, Open Graph and security headers. New in v3.0: a unified indexability verdict that combines the meta robots tag, the X-Robots-Tag HTTP header and robots.txt; robots.txt and sitemap.xml inspection (regular vs index); HTTP status code and full redirect chain; hreflang detection with x-default check; and a complete H1–H6 heading outline with skipped-level warnings. Content analysis: word count, heading structure, alt text, internal and external links. Heuristic domain estimates (labelled as such — not the proprietary DA/DR scores from Moz or Ahrefs). Actionable fix suggestions for every issue found. SERVER INFO IP address, geolocation (country, region, city), ISP, organization, ASN, timezone and hostname. DNS INFO A, AAAA, MX, NS, TXT, SOA and CNAME records via Google Public DNS. Subdomain discovery when available. TECH STACK Automatic detection of CMS and SSGs (WordPress, Next.js, Hugo, etc.), server software (Nginx, Apache), JavaScript frameworks, libraries, analytics and marketing tools, and font providers. ACCESSIBILITY (A11Y) 0-100 score with estimated WCAG compliance level (A, AA, AAA). Detects missing alt text, empty links and buttons, unlabeled form inputs, skipped heading levels, missing landmarks and positive tabindex values. Every issue includes a clear recommendation. EXTRA FEATURES - Report export: one-click Markdown export with data from all tabs. - Dark and light mode: preference saved across sessions. - Side Panel: open the extension in Chrome's side panel (Chrome 114+ required). PRIVACY All analysis runs locally. Diagnostic data is fetched from public APIs only (CrUX, ipwhois.app, Google Public DNS, RDAP.org), sending only the URL or domain you are analysing. No personal data, browsing history or metrics are sent to servers owned by the extension authors. The extension does not track you or collect analytics. WHO IT'S FOR Web developers, SEO professionals, system administrators and anyone who wants to understand the performance, accessibility and infrastructure of a website in seconds. Open source · Apache-2.0 · Maintained by vantag.dev