DevSEO - Technical SEO & Web Auditor

Technical SEO & Web Performance Inspector. Audit metadata, headings, Schema JSON-LD, Open Graph, links & Core Web Vitals.

🚀 DevSEO is the all-in-one Technical SEO, Metadata, and Web Performance Inspector designed for modern developers, technical SEO specialists, and QA engineers. Inspect any webpage instantly with zero external dependencies, 100% private client-side execution, and interactive in-page visual overlays! ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 🌟 CORE FEATURES & CAPABILITIES ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 📊 1. INSTANT SEO HEALTH SCORE & AUDIT • Weighted 0–100 SEO Score and letter grade (A–F) • Prioritized checklist categorized into Errors (🔴), Warnings (🟡), and Passed Checks (🟢) • Clear, actionable recommendations to fix every detected issue 🔍 2. GOOGLE SERP PREVIEW • Live search result snippet preview • Interactive Desktop vs. Mobile device view switcher • Character counter and pixel-width meter (~600px max) 📑 3. METADATA & TECHNICAL INSPECTION • Title Tag & Meta Description validation (length & pixel width) • Canonical Tag audit (detects duplicate canonicals, self-referential status, or cross-domain mismatches) • Robots Meta directives parser (index, noindex, follow, nofollow, nosnippet) • Hreflang language alternates inspection • Viewport, Charset, HTML Lang, Doctype, and Content Length checks 🏷️ 4. HEADING HIERARCHY TREE (H1–H6) • Complete visual heading hierarchy tree with indentation • Identifies missing H1, multiple H1s, skipped levels (e.g. H2 jumping to H4), and empty tags • "Scroll To" button: Smoothly scrolls the active webpage to the exact heading with a focus pulse ring 🖼️ 5. IMAGE & ACCESSIBILITY AUDIT (CLS PROTECTION) • Detects missing alt attributes and decorative images (alt="") • Flags images missing explicit width/height attributes that cause Cumulative Layout Shift (CLS) • Format inspection (WebP, AVIF, SVG vs unoptimized formats) and lazy loading status • Image thumbnail previews with one-click in-page inspection 🔗 6. INTERNAL & EXTERNAL LINKS AUDIT • Internal vs External link breakdown • Nofollow, sponsored, and ugc attribute detection • Security best practice verification: target="_blank" without rel="noopener" • Flags generic ("click here", "read more") and empty anchor texts 📱 7. SOCIAL CARDS & STRUCTURED DATA (SCHEMA.ORG) • Live Facebook & LinkedIn Share Card preview (Open Graph) • Live Twitter / X Share Card preview • JSON-LD Schema.org Inspector: Parses all schema blocks (Article, Organization, Product, Breadcrumbs, FAQ) • Syntax-highlighted code viewer with one-click "Copy Schema" button 🔤 8. KEYWORD DENSITY & N-GRAM ANALYSIS • 1-Word, 2-Word, and 3-Word phrase frequency and density percentage • Keyword stuffing alert if non-trivial words exceed 3.5% density • Content depth evaluation (word count and estimated reading time) ⚡ 9. CORE WEB VITALS & WATERFALL TIMINGS • Server Response Time (TTFB) with Good / Needs Work / Poor ratings • DOM Content Loaded (DCL) and Window Load Complete times • Navigation Timing waterfall breakdown (DNS, TCP, TLS, TTFB, DCL, Load) 🎨 10. IN-PAGE INTERACTIVE VISUAL OVERLAYS • [H#] Headings Overlay: Places color-coded level badges (H1, H2, H3) directly over elements on the live page • [IMG] Images Overlay: Highlights missing-alt images in bold red borders with warning badges • [🔗] Links Overlay: Outlines internal links in green, external in blue, and nofollow in amber 🛠️ 11. DEVELOPER TOOLS INTEGRATION & EXPORT • Dedicated Chrome DevTools panel tab (F12 -> DevSEO) for full-width inspection • Export complete audit report to Markdown (.md), JSON (.json), or Printable PDF • Direct 1-click links to Google Rich Results Test, PageSpeed Insights, and Schema.org Validator ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 🔒 PRIVACY & SECURITY ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ • 100% Client-side execution • Zero data collection, analytics, or external telemetry • No cookies or tracking scripts