What a real SEO audit should cover
A proper on-page SEO audit has four layers: metadata, structure, technical SEO, and content quality. PNX scores all four in one pass.
Stop pasting URLs into 6 different scanners. PNX is a free agentic SEO tool built for creators, founders and SEO teams who need real answers — fast — without paying $99/month for legacy platforms. This guide breaks down everything about free AI SEO audit tool in plain English, with a comparison table, internal links to our free tools, and a one-click way to try it yourself.
What PNX checks
- Metadata: title tag length, meta description, canonical, robots, Open Graph & Twitter cards
- Headings: H1 uniqueness, H2/H3 hierarchy, keyword presence
- Technical SEO: hreflang, viewport, lang attribute, mobile-friendliness signals
- Structured data: every JSON-LD schema on the page (Article, FAQ, Product, BreadcrumbList...)
- Content: word count, internal vs external link ratio, images missing alt text
Free SEO audit tools — honest comparison
| Tool | Free tier | AI insights | Signup | Speed |
|---|---|---|---|---|
| PNX | Unlimited | ✅ | No | <30s |
| Ahrefs Site Audit | 1 project, 5k pages | ❌ | Yes | Slow crawl |
| Semrush Site Audit | 100 pages/mo | ❌ | Yes | Slow crawl |
| Screaming Frog | 500 URLs | ❌ | Yes | Desktop install |
| Google Lighthouse | Unlimited | ❌ | No | Per-page |
How to interpret your audit
PNX flags issues by severity. Fix critical metadata first (title + description + canonical), then heading structure, then schema. For the heavier lift — content quality and topical authority — pair the audit with AI keyword research and a content strategy brief.
<div class="cta-glass-wrap"> <a class="cta-glass" href="/chat" data-prompt="Audit https://example.com and list every issue grouped by priority">Run a Free SEO Audit Now →</a> </div>Keep reading
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