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Differential crawl: understanding changes

The differential crawl compares two successive crawls to identify what changed on your site.

⏱ 3 min read · Updated on 22 April 2026

What is it for?

After a site update or SEO work, the differential crawl shows you exactly what changed between the last crawl and the previous one.

What it detects

  • New pages — URLs that appeared since the last crawl
  • 🗑️ Removed pages — URLs that no longer exist (or return an error)
  • ✏️ Modified pages — Pages whose title, H1, meta description, HTTP status or content changed
  • 📊 Score evolution — Health score delta between the two crawls

How to use it

  1. Run a crawl on a site that already has at least one previous crawl
  2. Once complete, open the crawl and navigate to the "Differential" tab
  3. Filter by type of change (new pages, removals, modifications)

Use cases

  • Verify that a migration has not broken important URLs
  • Confirm that your optimizations were properly applied
  • Detect accidental deletions after a CMS update

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