Screaming Frog SEO Spider vs Seolyzer

Screaming Frog SEO Spider is a powerhouse website crawler designed for in-depth SEO auditing. Deployed as a desktop application, it enables SEO professionals to swiftly crawl websites and uncover technical issues like broken links, duplicate content, and redirect chains. Through its intuitive interface, users can explore metadata, headlines, images, structured data, and pagination, all in one sophisticated dashboard.

Advanced filtering helps uncover indexing barriers such as headers missing tags, oversize pages, or uncompressed images that may degrade page speed. Custom extraction features allow targeting of bespoke content or scripts, while in-crawler SERP simulation helps mimic the search engine’s point of view. With support for integrations like Google Analytics and Search Console, it’s possible to enrich technical audits with real performance data.

Seolyzer is a hybrid SEO tool that combines site crawl diagnostics with server log analytics—offering a detailed look into how search engines interact with your site. It pinpoints crawl budget inefficiencies by identifying URLs that search engines request often, pages that trigger errors, or blocked file types that could harm indexation.

Alongside crawl log monitoring, Seolyzer provides technical SEO auditing: identifying missing titles, oversized pages, slow load times, or misconfigured headers.