Best Platforms for Monitoring Technical Aspects of a Website
A comprehensive overview of the best technical SEO monitoring platforms: SEO crawlers, Core Web Vitals tools, APM systems, and browser extensions. Pricing and feature comparison.
Free extension for Chrome, Edge & Brave
Quick page analysis in a side panel
For copywriters, frontend developers, SEO specialists and marketers. Check meta tags, Core Web Vitals and Schema.org without leaving the page.
Side Panel
Auto-refresh
100% Free
Features
Everything you need
Open the side panel and analyze. Navigate to another page — data updates automatically.
Smart Side Panel
Works in the browser's side panel — analyze any page without switching windows. Data refreshes automatically when URL changes
Core Web Vitals
Real measurements of LCP, CLS, INP, FCP and TTFB directly from Chrome API
Schema.org Validator
Validation of all 1007 Schema.org types with contextual recommendations and Google Rich Results compliance
Google Services
GA4 Event Monitor, Consent Mode v2 Validator, DataLayer Inspector and GTM/Ads detection
Tech Stack
Detection of CMS, frameworks, JS libraries, CDN and security headers
Site Essentials
Checking robots.txt, sitemap, favicon, security.txt, llms.txt and ads.txt
Social Preview
Open Graph and Twitter Cards preview - see how your page looks when shared
Sitemap Analyzer
Analyze sitemap.xml: HTTP status of each URL, H1, word count, CSV export
Headings H1-H6
Heading hierarchy analysis and structure error detection
Hreflang
Detection and validation of hreflang tags for multilingual sites
Content Analysis
Keyword density analysis: single keywords, bigrams and trigrams
Export
Generate PDF, CSV, JSON reports with full SEO and Google Services data
Dark Mode
Light or dark theme — auto-detects system settings or manual selection
Who is it for
A tool for everyday work
Everyday support for anyone who works with websites.
Copywriters
Check title and description length, image alt texts and H1-H6 headings before publishing
Frontend Developers
Verify Core Web Vitals, lazy loading, structured data and security headers after deployment
Analysts & Marketers
Check GA4, GTM, Consent Mode v2, dataLayer and events without DevTools
SEO Specialists
Quick on-page verification, Schema.org and Open Graph before submitting recommendations
Web Designers
Control image optimization, check responsiveness and detect layout issues (CLS)
Website Owners
Monitor your site's SEO health independently without expensive tools
All metrics in one view
The dashboard shows SEO health immediately after opening the panel. Overall score, meta tag status, link distribution and Core Web Vitals - no scrolling or searching.
- SEO Score 0-100 with category breakdown
- Title and description length validation
- Link distribution: internal, external, nofollow
- Images with missing alt text
Core Web Vitals straight from the browser
Real measurements from Chrome Performance API, not estimates from external tools. You see exactly what Google measures.
- LCP — Largest Contentful Paint time
- CLS — Layout shifts during loading
- INP — Responsiveness to user interactions
- FCP and TTFB — Additional performance metrics
Full structured data validation
JSON-LD detection and validation according to Schema.org specification. Check if your data qualifies for Rich Results in Google.
- Support for all 1007 Schema.org types
- Required and recommended field validation
- Preview of nested schemas and @graph
- Specific guidance on what to fix
Tech stack recognition
Check what any site is built on. Useful for competitor analysis and technical audits.
- CMS: WordPress, Shopify, Webflow, Wix...
- Frameworks: React, Vue, Next.js, Astro...
- Analytics: GA4, GTM, Hotjar, Clarity...
- Hosting and CDN: Cloudflare, Vercel, Netlify...
Open Graph Preview
- Preview how page looks on Facebook and LinkedIn
- Validation of og:title, og:description, og:image
- Image dimensions check (1200×630)
- Detection of missing OG tags
Twitter Cards
- Twitter/X card preview
- Support for summary and summary_large_image
- Validation of twitter:card, twitter:title, twitter:image
- Fallback to Open Graph when Twitter tags missing
Link analysis
- Breakdown: internal, external, nofollow
- Broken Link Checker — verify HTTP statuses
- Anchor text and rel/target attributes
- Export list to CSV/TXT
Image audit
- Alt text status for each image
- Dimensions and format (WebP, AVIF, PNG...)
- Lazy loading check
- Export list to TXT
File and header verification
Quick check if the site has all necessary configuration files and correct security headers.
- robots.txt, sitemap.xml, favicon
- security.txt and llms.txt
- Headers: CSP, HSTS, X-Frame-Options
- Google services: GTM, GA4, Consent Mode v2
Sitemap Analyzer
Dedicated tool for comprehensive sitemap.xml analysis. Fetch all URLs from sitemap and check their health.
- Fetch and parse sitemap index (nested sitemaps)
- HTTP status of each URL from sitemap
- H1 extraction and word count per page
- Export to CSV with configurable columns
Export data in multiple formats
Download audit results and send to client or import into your own tools.
- PDF — ready report for client
- CSV — data for spreadsheets
- JSON — integration with API and tools
- TXT — lists of links and images
Latest from the blog
New SEO KPIs: From Rankings to AI Citations
Classic SEO metrics are losing relevance. Discover new KPIs in the AI era: Share of Model, Citation Rate, AI response sentiment, and GEO metrics for real visibility in 2026.
OpenClaw & AI: Advanced SEO and AEO Strategies in 2026
How the autonomous OpenClaw agent transforms SEO and AEO processes in 2026. Architecture, automation, security threats, and content optimization for RAG systems.
Try it for free
Install the extension and start analyzing any page in seconds
Version 2.7.9 • February 2026