CrawlScience

A purpose-built SEO crawler for very large websites.

Performant, memory-efficient, and built around the questions technical SEOs actually ask. Designed for sites where existing tools run out of memory, miss the point, or both.

What it does

• Approaching 200 SEO hints Technical, content, on-page, internal linking, mobile, internationalisation, and rendering issues — surfaced as actionable signals.
• Incremental section recrawls Focus on what's changed, not the whole site. Built for crawls that take hours, not minutes.
• Log file analysis Process server logs at scale to see what Googlebot actually crawls — not just what you think it does.
• Historical comparison Diff your site against itself over time. See what changed, when, and how it shifted your structure.
• Site architecture visualisation See how your pages actually link. Identify orphans, isolated clusters, and authority flow at a glance.
• User-defined templates Define page types once, then analyse content and link patterns at the template level instead of URL by URL.

Who it's for

In-house SEO teams, agencies, and consultants working with enterprise-scale sites — anywhere the question is not "what's wrong with this page" but "what's wrong with this structure."