Web Vitals Extension — VANTAG.es

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