Technical SEO and site audits

Technical SEO tools check whether search engines can crawl, render and index a site, and whether pages load fast enough to give visitors a good experience. They find problems that are invisible from the page itself: broken links, redirect chains, pages blocked by robots.txt, duplicate titles, wrong canonical tags, missing hreflang and slow templates.

There are three kinds in this category. Crawlers such as Screaming Frog, Sitebulb and the cloud platforms walk a site link by link and list every URL with its status and tags. Search engine tools, Google Search Console and Bing Webmaster Tools, report what those engines actually indexed, which queries brought clicks and which pages they skipped and why. Speed tools such as PageSpeed Insights measure Core Web Vitals from real Chrome users and run a lab test on demand.

Use them together. A crawler shows what your site offers to a bot; Search Console shows what Google did with it. When the two disagree, for example a page your crawl finds easily that Google reports as discovered but not indexed, you have found something worth investigating.

Large sites add log file analysis, which reads the server's own record of bot visits. Logs show how often Googlebot reaches each section, whether it wastes visits on filters and parameters, and how quickly new pages get crawled. Several of the enterprise platforms here combine crawling, logs and monitoring for that reason.

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9 AI SEO tools in technical seo and site audits

Screaming Frog SEO Spider

by Screaming Frog

Desktop crawler that audits a site's URLs for broken links, redirects, titles, canonicals and other technical issues.

  • Free plan or free version

Sitebulb

Website crawler that explains each audit issue with priorities and visual reports, on desktop or in the cloud.

Google Search Console

by Google

Google's free tool for site owners: search clicks and queries, indexing status, sitemaps and page experience reports.

  • Free plan or free version
  • Developer API

Bing Webmaster Tools

by Microsoft

Microsoft's free tool for site owners to see Bing search performance, submit sitemaps and fix crawl issues.

  • Free plan or free version
  • Developer API

PageSpeed Insights

by Google

Free Google tool that reports a page's Core Web Vitals from real users plus a Lighthouse lab test.

  • Free plan or free version
  • Developer API

Lumar

Cloud crawler and technical SEO platform for large sites, formerly called Deepcrawl.

JetOctopus

Cloud crawler and log file analyzer that shows how search bots move through a large site.

Botify

Enterprise SEO platform combining crawling, log analysis and automation for large websites.

  • Developer API

Oncrawl

Technical SEO platform with a cloud crawler and server log analysis for medium and large sites.

Audit reports produce long lists of issues, and not all of them matter. Fix what stops pages from being crawled or indexed first, then what affects many pages at once through a template, then the rest. Run a crawl before and after every migration or major release, and keep the exports so you can compare.

Small sites do not need enterprise software. A free crawl, Search Console and PageSpeed Insights catch most problems on a site with a few hundred pages. The cloud platforms earn their place on large e-commerce, publishing and marketplace sites, where millions of URLs, faceted navigation and frequent releases make continuous monitoring worth paying for.

Whatever you use, write down what you changed and when. Search engines take days or weeks to recrawl, and a simple change log makes it far easier to connect a later rise or fall in Search Console with the fix, migration or release that caused it.

Questions about technical seo and site audits

Do I need a paid crawler if I have Google Search Console?

They do different jobs. Search Console reports what Google indexed and how pages perform. A crawler lists every URL on your site with its tags and status, which you need for audits and migrations. Screaming Frog's free version covers small sites.

What is the difference between field data and lab data in PageSpeed Insights?

Field data comes from real Chrome users visiting the page over recent weeks and is what Core Web Vitals assessments use. Lab data is a single simulated test, useful for debugging because you can rerun it after each change.

Why does Google say a page is crawled but not indexed?

Google fetched the page and decided not to index it for now, often because it looks thin, duplicates another page or adds little. Improve the page or consolidate it, then request indexing in Search Console.

When is log file analysis worth it?

Mostly on sites with many thousands of URLs, where crawl budget and bot behavior matter. Logs show what search engine bots actually requested, which a crawler cannot tell you.

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