Learn · SEO Checks

SEO checks explained

Our engine runs >60 checks on every URL — on-page SEO, technical health, structured data, performance, links, and AI readiness. Each explainer below documents exactly what we test, the thresholds we use, and how to fix failures on WordPress, Shopify, Webflow, and other platforms.

Explainers

Check-by-check guides

Technical SEOCanonical tags explainedWhat canonical tags do, why they matter for SEO, and how our engine detects missing, duplicate, or misconfigured canonicals.7 min read On-Page SEOMeta descriptions explainedWhat meta descriptions do for CTR and AI retrieval, and how our engine checks for missing, too-long, and duplicate descriptions.6 min read On-Page SEOTitle tags explainedThe #1 on-page ranking signal — how our engine checks for missing, too-long, too-short, and duplicate title tags.7 min read Structured DataStructured data (JSON-LD) explainedHow JSON-LD structured data helps search engines and AI systems understand your pages — and the four checks our engine runs.8 min read Technical SEOSecurity headers explainedWhat HSTS and X-Content-Type-Options headers do, why they matter for SEO trust signals, and how our engine checks them.6 min read On-Page SEOOpen Graph tags explainedWhat OG tags do for social sharing and AI visibility, and how our engine checks for missing og:title, og:description, and og:image.7 min read On-Page SEOHeading hierarchy (H1–H6) explainedHow heading structure affects SEO and accessibility — our engine checks for missing H1s, multiple H1s, and skipped heading levels.7 min read On-Page SEOImage alt text explainedWhat image alt text does for SEO, accessibility, and AI visibility — and how our engine detects images with missing alt attributes.6 min read Technical SEORobots.txt explainedWhat robots.txt does, how it controls search engine and AI crawler access, and how our engine checks for missing or overly restrictive files.7 min read PerformanceCore Web Vitals & performance explainedHow LCP, INP, CLS, and Lighthouse score affect SEO rankings — and how our engine checks real-user field data and lab metrics.9 min read Technical SEOInternal links & redirects explainedHow broken internal links and redirect chains hurt SEO — and how our engine detects errors and long chains on every URL.7 min read On-Page SEOThin content explainedWhat thin content is, why it hurts rankings, and how our engine flags indexable pages with fewer than 300 words.6 min read AI ReadinessAI readiness checks explainedHow our engine scores your AI visibility — llms.txt, AI bot access, question headings, FAQ schema, and content chunkability.8 min read LinksLink health explainedOrphan pages, click depth, broken external links, excessive links, and generic anchor text — five checks for a healthy link profile.8 min read Technical SEOHTTPS & mixed content explainedHow HTTP-to-HTTPS redirects, mixed content, and www/non-www consistency affect SEO and how our engine checks them.7 min read

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SEO checks explained

Check-by-check guides

Our free checker runs every check on this page against your URL in under 10 seconds — with CMS-specific fix instructions and an AI visibility score.