Web Vitals

Web Vitals Extension — Complete website analysis in a single popup.
Measure Core Web Vitals, run SEO 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) and specific fix suggestions for every metric that fails its threshold.

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.

SEO
SEO score 0-100 based on title, meta description, headings, images, structured data, Open Graph and security headers. Domain Authority and Domain Rating estimations. Content analysis: word count, heading structure, alt text, internal and external links. Actionable fix suggestions for every issue found.

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. Metrics are fetched from public APIs only (CrUX, ipwhois.app, Google Public DNS, Mozilla HTTP Observatory, RDAP.org). 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.

Maintained by vantag.es