SEO Audit · Reviewed May 2026

Best SEO Audit Tools (2026)

Eight audit tools rated by depth, speed, and price. Free options that beat paid alternatives, and the platforms worth paying for when you scale.

An SEO audit is one of those things where the 80% solution is free and very fast, and the deep 100% solution is hours of work. Below we’ve ranked tools by what we’d actually use — including the best free options that close the gap to paid platforms.

For a checklist version of what an audit should cover, see our Free SEO Audit Checklist.

1

MarqOps Free SEO Audit

Our pick
Free; rate-limited per IP

10-point audit covering Core Web Vitals + JSON-LD + on-page SEO + OpenGraph. Sub-15-second turnaround. No signup.

Pros

  • No signup required
  • Includes mobile PSI score + LCP/CLS/INP
  • Detects schema, OpenGraph, viewport, alt-text coverage
  • Plain-English fix copy per finding

Cons

  • Single-page audit (not full-site crawl)
  • 30 audits/hour rate limit per IP
Best for: Snapshot audits, prospect site checks, freelancers running quick scans
Read full comparison →
2

MarqOps (paid platform)

Our pick
Free tier; Pro $39/mo

Daily monitoring of multiple URLs — schema drift alerts, CWV trend tracking, AI Overview citation checks.

Pros

  • 25 monitored URLs per brand on free tier
  • Daily schema + CWV checks with drift notifications
  • Bundles audit with rank tracker + LLM mention tracker
  • Public API for piping audit data into your own dashboards

Cons

  • Not a deep-crawl tool (use Screaming Frog for that)
  • Smaller index than Ahrefs/Semrush for backlink/keyword research
Best for: Marketing-ops teams that need ongoing audit + monitoring, not one-off scans
Read full comparison →
3

Google Search Console + Lighthouse

Free

Google's own tools. Free, authoritative, and surprisingly capable for owned-site analysis.

Pros

  • Free + free + free
  • Coverage report shows indexing issues directly from Google
  • Lighthouse runs locally in Chrome DevTools
  • Real-user CWV data

Cons

  • Only works on your own verified sites
  • No site-wide crawl beyond what Google has indexed
  • No alerting layer — you have to check manually
Best for: Owned-site monitoring; the baseline every team should run alongside paid tools
4

Screaming Frog SEO Spider

Free up to 500 URLs; £199/year

The desktop crawler every SEO knows. Most thorough technical audit you can run.

Pros

  • Most comprehensive technical crawl
  • Configurable to the inch
  • Detects everything: redirects, canonical issues, hreflang, schema

Cons

  • Desktop app — clunky to share results
  • Manual triggering — no scheduled monitoring
  • Steep learning curve
Best for: Technical SEOs running full-site audits, especially for large or migrating sites
5

Ahrefs Site Audit

Lite $129/mo+

Cloud crawler integrated with Ahrefs's research suite. Strong if you're already paying for Ahrefs.

Pros

  • Cloud-based, scheduled scans
  • Integrated with rank tracking + competitor analysis
  • Strong reporting

Cons

  • Expensive if you only need audit
  • Slower iteration than dedicated audit tools
Best for: Existing Ahrefs subscribers
6

Semrush Site Audit

Pro $139/mo+

Comparable to Ahrefs Site Audit, slightly different UX, similar pricing.

Pros

  • Strong reporting + alerting
  • Bundled with keyword + competitive research
  • Good white-label options

Cons

  • Expensive standalone
  • Less granular than Screaming Frog
Best for: Existing Semrush subscribers
7

Sitebulb

£11.50/site/month

Desktop crawler with strong visualization. The Screaming Frog alternative for visual learners.

Pros

  • Best-in-class crawl visualizations
  • Good prioritized issue reporting
  • Strong UX for non-technical users

Cons

  • Per-site pricing adds up for agencies
  • No real-time monitoring
Best for: Agencies presenting audit results to clients
8

Pingdom / GTmetrix

Free; paid from $14/mo

Speed + Core Web Vitals only. Good complement to a full audit tool.

Pros

  • Easy speed checks
  • Historic CWV trends

Cons

  • Speed only — not a full SEO audit
  • Free tier is rate-limited
Best for: Performance-only deep dives

The minimum-effort audit stack

For most teams, this combo covers 95% of audit needs at <$50/mo:

  1. MarqOps free tier for ongoing schema + CWV monitoring (free)
  2. Google Search Console for indexing + core web vitals real-user data (free)
  3. Screaming Frog free when you need a deep technical crawl (free for <500 URLs)

Above that — add MarqOps Pro ($39/mo) for unlimited monitoring + the rest of the platform.

FAQ

What's the cheapest SEO audit tool?⌄

Free options that genuinely deliver value: MarqOps (full audit + ongoing schema/CWV monitor), Google Search Console (your own site), Lighthouse (in Chrome DevTools). Most paid tools justify their price only above 10K monthly organic visitors.

How often should I audit?⌄

Snapshot audits monthly; ongoing automated checks daily for sites where SEO is critical to revenue. Schema and Core Web Vitals can regress overnight on a CMS update — daily monitoring catches it; monthly snapshots don&rsquo;t.

Do I need both Ahrefs and an audit tool?⌄

Ahrefs/Semrush&rsquo;s site-audit features overlap with dedicated audit tools, but Ahrefs is research-first. If you only do quarterly audits, the audit features included in those platforms are sufficient.

Try MarqOps free

Free tier includes one brand, full SEO trackers, and a public read API. No credit card.

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