A temporary redirect where a permanent one belongs.
Found by Redirect checker →
The URL redirects back to itself and never settles.
Found by Redirect checker →
Compare crawls before and after
Before/after crawl diffs, declared URL migrations and segment diffs from saved scans, without crawling again.
Compare crawls before and after
Compatible comparisons
Native crawls and Screaming Frog may find different URL populations; compare them only with compatible scope and configuration.
Compare crawls before and after
Migrations
Declare the migration and check what moved, what broke and what was lost.
Three steps, one saved scan
Save a scan for each side
Run crawl-site before and after the change, or import a Screaming Frog audit. Each run leaves one saved file you can compare later.
Diff the two saved files
compare-crawls reads both files and sorts every finding into entered, left, appeared or disappeared. It fetches nothing.
Tell a fix from a missing page
left means the URL was fetched by both crawls and the finding is gone. disappeared means the URL was not rechecked, so it proves nothing. Use verify-fixes for a verdict on specific findings.
Checks in this feature
| Check | What it means | Severity | Evidence |
|---|---|---|---|
BROKEN_PAGE_4XX | A page returns a 4xx. The diff shows whether it entered (new breakage) or left (fixed on a URL both crawls fetched). | Critical | Before and after finding rows for the same URL |
SERVER_ERROR_5XX | A page returns a 5xx. The same entered, left or disappeared logic applies between the two crawls. | Critical | Before and after finding rows for the same URL |
TITLE_MISSING | The title element is missing on a page. A regression shows as an entered row, a fix as a left row. | Critical | Before and after finding rows for the same URL |
REDIRECT_CHAIN | A redirect chain has two or more hops. Useful after a migration to confirm chains were not added. | Important | Before and after finding rows for the same URL |
CANONICAL_MISSING | An indexable page has no canonical URL. Catches canonicals dropped in a template release. | Important | Before and after finding rows for the same URL |
URL_NOT_IN_SITEMAP | An indexable page is missing from the sitemap. Shows whether the sitemap caught up with the release. | Tip | Before and after finding rows for the same URL |
One command
seohead compare-crawls --before ./scans/before.sqlite --after ./scans/after.sqliteInstall first: installation guide. Every command also runs as an MCP tool for AI agents.