SEO Scanner is the most complete free technical SEO audit tool.
Paste any URL ā get a full-site crawl via sitemap or deep crawling.
What it checks:
ā Meta tags, headings, images, canonical, robots, structured data
ā Google PageSpeed Insights scores (performance, accessibility, SEO)
ā Security headers (HTTPS, HSTS, CSP, X-Frame-Options)
ā Duplicate content detection across the entire site
ā Internal link architecture analysis
