Render a page with headless Chromium and return the full rendered HTML. Use this when the page is a SPA or uses client-side rendering.

Fetch the raw HTTP response without JS rendering. Returns JSON with status code, headers, body, redirect chain, and timing.

Analyze meta tags: title (with pixel-width estimation), meta description, canonical (self-referencing check), robots, viewport, charset, lang, Open Graph tags, Twitter Card tags, hreflang tags, and favicon.

Extract and validate the heading hierarchy (h1-h6). Checks for single H1, skipped levels, empty headings, duplicate headings, and long headings (>70 chars).

Analyze all links on a page: internal vs external count, nofollow/sponsored/ugc detection, anchor text analysis, pagination detection, follow ratio, and optional broken link checking.

Audit images: alt text presence, lazy loading, explicit dimensions (width/height for CLS), modern format usage (WebP/AVIF), srcset and picture element analysis.

Analyze page content: word count, Flesch-Kincaid readability score, reading grade level, keyword density, sentence analysis, text-to-HTML ratio, top keywords, bigrams, trigrams, and keyword stuffing detection.

Inspect HTTP response headers: caching (Cache-Control, ETag), security (HSTS with max-age validation, CSP, X-Frame-Options), SSL certificate validation, cookie security (Secure/HttpOnly/SameSite), compression, server info, and redirect chain analysis.

Discover and parse XML sitemaps: checks /sitemap.xml, /sitemap_index.xml, and robots.txt Sitemap directives. Validates URL count limits (50K), file size (50MB), lastmod format (W3C), and freshness.

Fetch and analyze robots.txt: parses user-agent rules (Disallow/Allow), crawl-delay, sitemap directives. Detects blocking of important bots (Googlebot, Bingbot), CSS/JS resource blocking, contradictory rules, and file size limits.

Extract and validate structured data: JSON-LD, Microdata, and RDFa. Validates Schema.org required properties, checks Rich Result eligibility, detects @context and @graph handling, and recommends WebSite/Organization schemas.

Measure all Core Web Vitals: TTFB, FCP, LCP, CLS (Cumulative Layout Shift), TBT (Total Blocking Time), DOM nodes, total requests, transfer size, render-blocking resources, and resource breakdown by type.

Analyze mobile-friendliness: viewport meta, responsive design detection, font sizes (<12px check), tap target sizes (48x48dp check), horizontal scroll, pinch-to-zoom disabled check, intrusive interstitial detection, and content width validation.

Analyze URL structure for SEO best practices: length, depth, separator usage (hyphens vs underscores), uppercase detection, tracking parameter detection, session ID detection, file extensions, and path keyword extraction.

Analyze page accessibility: ARIA landmarks (main, nav, banner), skip navigation links, ARIA roles/labels, image alt text audit, form input labeling, table headers, link accessible text, and focus management (tabindex). Returns a score out of 100.

Run a comprehensive SEO audit with weighted continuous scoring (0-100): Meta Tags, Heading Structure, Content Quality, Images, Structured Data, Links. Returns overall score with individual check scores and severity-prioritized issues.

Generate a comprehensive SEO report combining ALL analyses: HTTP headers, SSL validation, meta tags, headings, links, images, structured data, content quality, sitemap, robots.txt, performance (Core Web Vitals), mobile-friendliness, and lighthouse scoring. This is the most complete analysis available.

Crawl a website discovering pages via internal links. Analyzes each page for meta tags, headings, and common SEO issues. Returns a site-wide summary with cross-page duplicate detection.