Screaming Frog is the industry standard for on-site technical SEO audits. On an adult directory or tube with tens of thousands of indexed URLs, it quickly surfaces broken links, redirect chains, duplicate title tags, thin content pages, and missing structured data - the class of problems that quietly bleed organic traffic. Recent versions added MCP support, letting you automate crawls and query data via AI tools, which meaningfully speeds up large-site workflows.

At roughly EUR 245/year for a single licence, it is one of the best-value professional tools in SEO. Windows, macOS, and Linux builds are all actively maintained.