Web Vitals Extension

Web Vitals - Complete Website Performance, SEO & Infrastructure Analysis The most comprehensive Chrome extension for website analysis. Combines Google's official Web Vitals metrics with advanced SEO analysis, security scoring, server intelligence, and DNS diagnostics in one powerful tool.

🚀 WHAT YOU GET

Core Web Vitals Monitoring Real-time performance metrics (LCP, CLS, FCP, TTFB) plus field data from Chrome UX Report. Color-coded performance indicators show you instantly if a site passes Google's thresholds.

🎯 SEO Analysis Tab (NEW)

Comprehensive on-page SEO scoring that analyzes: SEO Score (0-100): Evaluates title tags, meta descriptions, heading structure, image alt text, canonical URLs, Open Graph, structured data, and security headers Domain Authority (0-100): Estimates domain strength based on TLD quality, HTTPS, security configuration, and domain characteristics Domain Rating (0-100): Assesses potential backlink quality and link profile strength Instant detection of SEO issues like missing meta tags, images without alt text, multiple H1s, security vulnerabilities, and more. All analysis happens locally in your browser—no page content transmitted.

🌍 Server Intelligence

Reveals hosting infrastructure: IP addresses, geographic location with coordinates, ISP details, ASN, and timezone. Essential for verifying CDN setup, local SEO audits, and infrastructure debugging.

🔍 Complete DNS Analysis

Shows all record types (A, AAAA, CNAME, MX, NS, TXT, SOA) in one view. Debug email delivery, verify domain ownership, check DNS propagation, and audit configurations without switching tools.

💻 Tech Stack Detection (NEW)

Automatically identifies: CMS & frameworks (WordPress, React, Vue, Next.js) Server technologies (Nginx, Apache, Node.js) Analytics tools (Google Analytics, Hotjar) Font providers and libraries

♿ Accessibility Audit (NEW)

WCAG compliance checking with: A11y Score (0-100) WCAG level estimation (A, AA, AAA) Detailed issue detection by category Good practices recognition

🎨 MODERN UI FEATURES

Dark/Light Mode: Toggle between themes with your preference saved automatically Six Powerful Tabs: Web Vitals, Server Info, DNS, SEO, Tech Stack, Accessibility Clean Design: Minimalist interface inspired by shadcn design principles Fast & Responsive: Lazy loading ensures data is fetched only when needed

💡 WHY THIS EXTENSION

Built for Professionals Developers get performance and SEO metrics alongside technical details. SEO specialists can audit sites instantly. System administrators verify DNS and hosting in seconds. All without leaving your browser.

Privacy-First Design Zero tracking, no data collection. API calls only when you request them. Uses free public APIs (Mozilla Observatory for security, ipwhois.app for geolocation, and Google DNS) with HTTPS-only connections. All SEO analysis happens locally—only domain names are sent to APIs, never your page content.

No Paid APIs Required 100% free to use. No API keys needed from Moz, Ahrefs, or SEMrush. Unlimited usage with smart local algorithms inspired by professional SEO tools.

🔧 TECHNICAL FEATURES

Smart Analysis: Lazy loading: Fetches data only when needed Local SEO scoring: Domain Authority and Rating calculated in-browser Parallel API queries: Results in 2-3 seconds Non-blocking architecture: UI stays responsive Modern tabbed interface with persistent dark mode preference Visual Indicators:

Animated circular score indicators Color-coded status (Green ≥70, Orange 40-69, Red <40) Issue detection with actionable recommendations Length indicators for title and meta description optimization Original Features Preserved: All Google Web Vitals Extension features: ambient badge indicators, console logging, HUD overlay, and Chrome UX Report integration.

👥 WHO USES THIS

SEO Specialists: Instant audits of on-page optimization and security headers Web Developers: Debug performance while checking SEO implementation DevOps Engineers: Verify infrastructure and security configurations Digital Marketers: Quick site analysis during competitor research Content Creators: Ensure pages meet SEO best practices before publishing System Administrators: DNS and server infrastructure verification

📊 SEO SCORING METHODOLOGY

SEO Score Factors (100 points total): Optimized title (30-60 chars) - 10 pts Meta description (120-160 chars) - 10 pts Single H1 tag - 8 pts Images with alt text - 8 pts Canonical URL - 4 pts Mobile viewport - 4 pts Language & charset - 8 pts Open Graph tags - 8 pts Structured data - 8 pts Internal links - 4 pts Robots compliance - 4 pts HTTPS, HSTS, CSP - 12 pts Content quality (word count, headings) - bonus points Domain Authority (0-100 estimated): Based on HTTPS status, TLD quality (.gov/.edu score highest), domain length (shorter = older/premium), security configuration, and recognized brand status.

Domain Rating (0-100 estimated): Focuses on backlink potential through domain quality indicators: security strength, TLD premium status, name characteristics (no hyphens/numbers scores higher).

🔒 TRANSPARENCY

What We Don't Do: Query real backlink databases (requires paid APIs) Verify actual domain age via WHOIS Count real backlinks (requires crawler infrastructure) Track your browsing or collect personal data What We Do:

Provide smart estimations based on verifiable factors Combine on-page analysis with domain characteristics Use algorithms inspired by Moz DA and Ahrefs DR Offer instant insights for quick audits and reports

🚀 INSTALLATION & USAGE

Install from Chrome Web Store Navigate to any website Click the extension icon Switch between tabs to analyze different aspects No configuration required. No API keys needed. Just install and analyze.

📝 OPEN SOURCE

Enhanced fork of Google's official Web Vitals Extension with 5 additional analysis tabs: SEO Analysis with scoring Server & Hosting Intelligence Complete DNS Records Technology Stack Detection Accessibility Audit GitHub: VANTAGhq/web-vitals-extension Maintained by: vantag.es