Free SEO Audit Tool vs Semrush Site Audit
Quick answer
Checks 22 on-page factors for a single URL instantly — title, meta, headings, images, canonical, and more. Semrush Site Audit is different in scope — full-site technical seo crawler and monitoring platform. Neither is trying to fully replace the other.
Free SEO Audit Tool
Checks 22 on-page factors for a single URL instantly — title, meta, headings, images, canonical, and more.
Use it when: You want a fast, single-page check with no signup.
Semrush Site Audit
Crawls an entire site, tracks issues over time, and is bundled inside a broader keyword and competitive-research platform.
Use it when: You need to crawl and monitor an entire site's technical health on an ongoing basis.