The 10 best technical SEO tools in 2027, ranked by the job they do

Transparency: Sorank is our own software, and its free extension and free tools appear in this ranking at eighth place, because Sorank is not a site crawler and should not be compared head-on with one. I ranked the tools on the technical jobs a site owner or SEO actually has to do (crawling, indexing, speed, JavaScript rendering, logs, structured data, AI crawler access), using the features and prices each company publishes on its own website, checked in October 2026.

Technical SEO is the work that decides whether a page can be fetched, rendered and indexed at all. Google's own documentation shows how literal this is: when crawling for Search, Googlebot crawls the first 2MB of a supported file, and anything after that limit is ignored. No amount of content work fixes a page that is cut off, blocked or invisible. The tools below exist to find those problems before they cost traffic, and in seven years of SEO work I have found that the order you use them in matters as much as which ones you pick. If the discipline itself is new to you, start with our definition of technical SEO.

Which technical SEO tool should you use for each task?

Each technical task has one tool that does it best and, in most cases, a free option that covers small sites. The table below is the short answer; the ranking that follows explains each tool.

Task	Best dedicated tool	Free option	What to check first
Crawling the whole site	Screaming Frog SEO Spider, Sitebulb	Screaming Frog free version (500 URLs), Ahrefs Free	Status codes, redirect chains, canonicals, orphan pages, duplicate titles
Indexing	Google Search Console	Google Search Console, Bing Webmaster Tools	Page indexing report, URL Inspection, sitemap status
Speed and Core Web Vitals	PageSpeed Insights, Lighthouse	Both are free	LCP, INP and CLS on mobile, from field data first
Server logs	Oncrawl, Botify, Screaming Frog Log File Analyser	None comparable	Which URLs Googlebot and AI bots really fetch, and how often
JavaScript rendering	Screaming Frog (paid), Sitebulb, Chrome DevTools	Chrome DevTools, URL Inspection in Search Console	Content present in the raw HTML, not only after rendering
Structured data	Google Rich Results Test, Screaming Frog	Rich Results Test, Sorank extension	Valid JSON-LD that matches the visible content
AI crawler access	Sorank robots.txt checker and extension	Both are free	GPTBot, OAI-SearchBot, ClaudeBot and PerplexityBot rules in robots.txt

The 10 best technical SEO tools in 2027

1. Screaming Frog SEO Spider: the reference crawler

What it does. Screaming Frog SEO Spider is a desktop crawler for Windows, macOS and Linux that follows every link of a site and lists what it finds: status codes, redirects, titles, meta descriptions, headings, canonicals, hreflang, directives and duplicate content. The paid licence adds JavaScript rendering, custom extraction, saved crawls, crawl comparison, scheduling and integrations with Google Analytics, Search Console and PageSpeed Insights.

Who it is for. Anyone who audits sites regularly: in-house SEOs, freelancers and agencies. It is the tool most technical SEO tutorials assume you have.

Pricing. Free up to 500 URLs per crawl. The licence costs £199 per year per user, shown as €245 per year in euros, checked in October 2026. Log analysis is a separate product, the Log File Analyser, sold on its own licence.

Limit. It runs on your machine, so very large sites depend on your memory and disk, and the interface is a set of data tables you have to interpret yourself.

2. Google Search Console: what Google really indexes

What it does. Google Search Console is the only tool that shows Google's own view of your site: the page indexing report with the reason each excluded URL is excluded, URL Inspection with the rendered HTML Googlebot saw, sitemap submission, the Core Web Vitals report from real users, crawl stats, manual actions and security issues.

Who it is for. Every site owner, without exception. A crawler tells you what could go wrong; Search Console tells you what Google actually did.

Pricing. Free. Pair it with Bing Webmaster Tools, also free, to get the same kind of data for Bing.

Limit. It reports on your own verified sites only, data arrives with a delay, and it does not crawl on demand the way a dedicated crawler does.

3. Sitebulb: the audit you can hand to a developer

What it does. Sitebulb is a crawler available as Sitebulb Desktop and Sitebulb Cloud. Its site states that more than 300 issues are automatically checked and turned into prioritized Hints, with data visualizations and JavaScript rendering at no extra cost.

Who it is for. Consultants and teams who need to explain findings to non-specialists, because each Hint comes with the reason it matters.

Pricing. Sitebulb Desktop Lite is $18 per month on its pricing page, with a 14-day free trial; Sitebulb Cloud starts from £95 per month. Checked in October 2026.

Limit. Less flexible than Screaming Frog for custom extraction and scripted workflows, and the Cloud version is priced for teams.

4. PageSpeed Insights and Lighthouse: speed and Core Web Vitals

What they do. PageSpeed Insights tests one URL and returns two kinds of data: field data from real Chrome users over the last 28 days, and lab data from Lighthouse that locates the cause of a slow page. Google's thresholds for a good experience are an LCP of 2.5 seconds or less, an INP of 200 milliseconds or less and a CLS of 0.1 or less, measured at the 75th percentile, according to web.dev's Core Web Vitals guide.

Who it is for. Developers and site owners fixing slow templates. Lighthouse also runs inside Chrome DevTools, so you can test pages that are not public yet.

Pricing. Free, no account needed.

Limit. One URL at a time, and lab scores move between runs. Judge field data and template trends, not a single score.

5. Chrome DevTools: page-level debugging

What it does. Chrome DevTools is built into the browser. The Network panel shows status codes, redirects, response headers and the size of every file; the Coverage panel shows unused CSS and JavaScript; the Performance panel records what blocks rendering; and you can switch the user agent to see what a bot receives.

Who it is for. Anyone who has found a problem with a crawler and now needs to understand why it happens on one specific page.

Pricing. Free.

Limit. The Elements panel shows the rendered page, not the raw HTML. To see what an AI crawler sees, use view-source or a raw fetch instead.

6. Ahrefs Free (formerly Ahrefs Webmaster Tools): a free scheduled audit

What it does. Ahrefs Free, the new name of Ahrefs Webmaster Tools, gives verified site owners Site Audit, which checks for more than 170 technical and on-page issues, plus Site Explorer for organic keywords and backlinks.

Who it is for. Site owners who want a recurring cloud crawl without installing anything or paying for a full suite.

Pricing. Free, with 5,000 crawl credits per verified project per month, on an unlimited number of verified sites. Checked in October 2026.

Limit. Only for sites you can verify, and the crawl allowance is too small for large sites.

7. Semrush Site Audit: technical checks inside an all-in-one suite

What it does. Semrush Site Audit crawls a project on a schedule, scores its health and groups issues into errors, warnings and notices, next to keyword research, rank tracking and competitor data in the same account.

Who it is for. Teams that already pay for Semrush for keywords and want technical monitoring in the same place.

Pricing. Site Audit is included in the SEO plan, listed at $139 per month, with a free plan for testing and a 7-day free trial. Checked in October 2026.

Limit. Expensive if technical auditing is all you need, and less granular than a dedicated crawler.

8. The free Sorank Chrome extension and free technical tools: one page, one click, AI crawlers included

What it does. The free Sorank SEO and GEO Chrome extension audits the page you are on in one click. Its tabs cover an SEO score and heading structure, images (missing alt text, potential size savings), internal and external links, a technical tab (robots.txt, sitemap, llms.txt, HTTPS, hreflang, HTML size against Google's 2MB limit, CSS and JavaScript coverage, Core Web Vitals on mobile and desktop), metadata with Open Graph and structured data, readability, and a GEO score with AI crawler permissions and an AI crawler view of the page. It works in Chrome, Edge, Brave and Opera.

Next to it, Sorank publishes free single-purpose tools: a robots.txt checker that shows which AI bots you allow or block, a sitemap checker that validates the file and its URLs, an HTTP headers checker that reveals X-Robots-Tag directives the HTML never shows, a redirect checker, an hreflang generator, a heading analyzer and a page size checker.

Who it is for. Anyone who wants a fast diagnosis of one page, during a call or before a fix, and anyone checking AI crawler access, which most classic crawlers do not report.

Pricing. Free.

Limit. It audits one page at a time and does not crawl a whole site, analyze logs or schedule audits. That is why it sits eighth: use it next to a crawler, not instead of one.

9. Oncrawl: crawl plus logs for large sites

What it does. Oncrawl combines a cloud crawler with a Log Analyzer that shows how Googlebot, Bingbot and AI bots really move through a site, with unsampled data, scheduled crawls, a REST API and integrations.

Who it is for. E-commerce and media sites with tens of thousands of URLs, where crawl budget is a real constraint.

Pricing. Not published; access goes through a demo. Checked in October 2026.

Limit. Oversized for small sites, and log analysis needs access to server logs, which often means involving the hosting team.

10. Botify: the enterprise platform

What it does. Botify combines a site crawler, analytics of how AI agents and search bots hit your site through log analysis, and automation features for indexing and internal linking, aimed at very large sites.

Who it is for. Large retailers, marketplaces and publishers with millions of URLs and a dedicated SEO team.

Pricing. On request, through a demo. Checked in October 2026.

Limit. Priced and staffed for enterprises; a small business will not use most of it.

How do the best technical SEO tools compare on price?

The entry price ranges from free to an enterprise quote. Five of the ten tools are free, and Screaming Frog and Semrush add a useful free tier.

Tool	Type	Best for	Entry price (October 2026)
Screaming Frog SEO Spider	Desktop crawler	Full site crawls, custom checks	Free up to 500 URLs, then £199 per year (€245)
Google Search Console	Google data	Indexing, real-user Core Web Vitals	Free
Sitebulb	Desktop and cloud crawler	Prioritized, explained audits	$18 per month (Lite), 14-day trial
PageSpeed Insights and Lighthouse	Speed testing	Core Web Vitals diagnosis	Free
Chrome DevTools	Browser debugging	Headers, rendering, file weight	Free
Ahrefs Free	Cloud audit	Recurring audit of verified sites	Free, 5,000 crawl credits per project per month
Semrush Site Audit	Cloud audit in a suite	Teams already on Semrush	SEO plan at $139 per month
Sorank extension and free tools	Page audit, single-purpose checks	One-page diagnosis, AI crawler access	Free
Oncrawl	Cloud crawler and logs	Large sites, crawl budget	Not published, demo
Botify	Enterprise platform	Millions of URLs	On request

Which technical SEO tools check AI crawlers like GPTBot?

AI crawler access is checked in robots.txt and in the raw HTML, and few classic crawlers report it by default. In 2026 this check matters as much as Googlebot access, because a single wrong line can remove a site from an AI assistant's answers.

The rules differ by bot. OpenAI's crawler documentation lists OAI-SearchBot, which surfaces sites in ChatGPT search; GPTBot, which collects content that may be used for training; and ChatGPT-User, which fetches a page when a user asks, and to which robots.txt rules may not apply. Blocking GPTBot keeps you out of training data, while blocking OAI-SearchBot keeps you out of ChatGPT search answers. On the Google side, Google-Extended is a product token that controls use of your content for Gemini and does not affect Google Search.

The second check is rendering. In a study of hundreds of millions of crawler requests, Vercel found that none of the major AI crawlers render JavaScript: ChatGPT's and Claude's crawlers fetch JavaScript files (11.50% and 23.84% of their requests) but do not execute them. A page whose content only appears after client-side rendering is visible to Google and empty for ChatGPT, Claude and Perplexity. Test it by searching the raw HTML for a sentence from the page, with view-source or the AI crawler view in the Sorank extension.

Do you need an llms.txt file for technical SEO?

An llms.txt file is optional and has no confirmed effect on rankings or AI citations. It is a plain-text file at the root of a site that summarizes its key pages for language models, and Google states that you don't need to create AI text files or special markup to appear in AI Overviews or AI Mode.

My recommendation: create one if it costs you ten minutes, with our free llms.txt generator, and spend your real effort on the checks that are proven to matter: robots.txt rules per bot, content in the raw HTML, a clean sitemap and pages that load fast.

In what order should you run a technical SEO audit?

Run a technical audit in the order of what blocks traffic first: indexing, then rendering, then speed. A fast page that is not indexed earns nothing, and the free tools above cover every step on a small site.

1. Indexing. Open the page indexing report in Search Console and list the important URLs that are excluded, with the reason given.
2. Crawl. Crawl the site with Screaming Frog or Sitebulb and fix 4xx errors, redirect chains, missing canonicals and duplicate titles.
3. Robots and sitemap. Check that robots.txt declares the sitemap, blocks nothing by accident and allows the AI bots you want, then validate the sitemap.
4. Rendering. Compare raw HTML and rendered page for each template, in DevTools or with URL Inspection.
5. Speed. Test each template in PageSpeed Insights, mobile first, and fix the largest image and the render-blocking scripts.
6. Logs, on large sites only. Use Oncrawl, Botify or the Screaming Frog Log File Analyser to see where Googlebot spends its crawl budget.

For the full method of analyzing a site beyond the technical layer (content, keywords, backlinks, visibility in AI), read our step-by-step guide to SEO analysis.

What do technical SEO tools not do?

Technical SEO tools find problems; they do not create the content that earns traffic. Once a site is crawlable, indexed and fast, its growth depends on publishing pages that answer what customers search for on Google and ask the AIs, and on linking them together.

That second part is the job Sorank automates. The software reads your site, finds the questions your customers ask ChatGPT, Claude and Gemini and checks every week whether your brand is mentioned, extracts your competitors' keywords into an editorial calendar, then writes and publishes the articles on your CMS with internal links, FAQ, meta tags and JSON-LD schema. The technical audit stays with the free extension and with the tools in this ranking; the content runs on autopilot. SEO results generally take 2 to 4 months.

Conclusion

For most sites, the best technical SEO stack in 2026 is free: Google Search Console, the free version of Screaming Frog, PageSpeed Insights and a robots.txt check for AI bots. Move to the paid Screaming Frog licence or Sitebulb when the site passes 500 URLs or needs JavaScript rendering, and to Oncrawl or Botify when crawl budget and logs become the real question. Once the technical foundation is clean, the next lever is content: compare the Sorank plans, from $99 per month or $49 per month billed annually, with a 3-day free trial and a 90-day money-back guarantee.