Fix verification
After a fix goes live, re-check the affected pages. Crawler records what the site actually shows now, not just whether the task was ticked off.
Uncertainty stays visible
If a page could not be checked, for example because the site was down, Crawler says so instead of quietly counting it as fixed.
What changed since last time
Compare two audits of the same site and see what changed, so a new problem shows up before a client finds it.
What search engines see
Compare what a page shows before and after it fully loads, so you can spot content that search engines and AI tools might miss.