SEO Auditor

Comparisons · SEMrush

SEO Auditor vs. SEMrush

SEMrush is the all-in-one digital marketing platform — keyword research, backlink intelligence, competitive intel, rank tracking, content optimisation, and a site auditor. It starts at $139.95/month and goes up. Here's the honest comparison for the technical-audit piece of what they do.

Pricing at a glance

SEO Auditor

  • Free
    $0 forever
    Unlimited audits

SEMrush

  • Pro
    $139.95 per month
    5 projects, 100k pages/mo
  • Guru
    $249.95 per month
  • Business
    $499.95 per month

Where each tool wins

Where SEO Auditor wins

  • Free with no signup or credit card — start auditing in 5 seconds
  • GEO/AEO depth (llms.txt, AI-crawler accessibility, Island Test) SEMrush doesn't cover
  • Open-source check definitions — every rule and threshold is auditable on GitHub
  • Streamed live results — no waiting for batch reports to email-back
  • JSON-LD validation with required + recommended fields per schema type
  • Shareable report URLs with no account creation required from viewer

Where SEMrush wins

  • Backlink database (200+ billion backlinks tracked) — we cannot build this
  • Keyword volume + difficulty + competitive rank tracking for 25B keywords
  • Content Gap analysis vs. specific competitor domains
  • Position Tracking for daily SERP monitoring (we don't do this at all)
  • Decade of brand recognition and enterprise integrations
  • Built-in PPC analysis for paid-search teams

When to pick which

Pick SEO Auditor when…

  • You want technical SEO without paying for keyword research you won't use
  • You're a developer or indie hacker, not a full-time SEO marketer
  • You need to audit one-off URLs without setting up a "project"
  • You care specifically about AI search ranking, not just Google

Pick SEMrush when…

  • You're running paid SEO for clients and need backlink + competitor data
  • You manage 5+ ongoing projects with rank tracking and recrawl schedules
  • You're a marketing team blending SEO with content + PPC strategy
  • You need brand-name credibility in client proposals

Our honest recommendation

Use SEO Auditor for the technical-audit and GEO/AEO piece. Use SEMrush (or Ahrefs) when you need backlink intelligence or competitor research — those require crawl infrastructure we can't replicate.

Want to try SEMrush? Visit SEMrush ↗ (affiliate link — same price for you, helps keep this tool free).

Frequently asked

Is SEMrush worth $140/month for a small business?

If you're actively investing in content marketing and backlinks, yes. If you just want a technical audit and your DIY content strategy, save the money — use SEO Auditor for technical health and Google Search Console (free) for keyword data.

What does SEMrush do that you cannot?

Backlink intelligence (who links to you and your competitors), keyword volume data, position tracking, and competitive content-gap analysis. Those all require billions of dollars of crawl infrastructure we don't and won't have.

What do you do that SEMrush cannot?

GEO/AEO depth (Island Test, llms.txt validation, AI-crawler comparison), open-source rules, no signup friction, live SSE-streamed results, and shareable public report URLs.

Run a real audit now

No signup, no credit card. See exactly what we catch vs. SEMrush.

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