SEO
Screaming Frog
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Screaming Frog SEO Spider is a website crawler that helps you improve onsite SEO by auditing for common SEO issues. Download & crawl 500 URLs for free, or buy a licence to remove the limit & access advanced features.
surferseo
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Surfer is a powerful tool that streamlines the process of researching, auditing, writing, optimizing, and generating SEO-optimized articles in just 20 minutes.
httpstatus
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httpstatus.io is an amazing tool to quickly bulk test redirects after a migration, finding redirect chains and http status codes. A very nifty tool for any seo who's serious about migrations.