1 · See it
The agent view
The answer an agent receives about any domain, rendered for a person: each action’s decision and the reason.
What is an SEO audit? The checks that matter, in the order to fix them
In one sentence
An SEO audit is a review of the technical and on-page factors that decide whether search engines can crawl, understand and rank a site — crawl access, sitemaps, status codes, canonical URLs, structured data, titles, content and speed — producing a prioritised list of fixes.
An SEO audit checks whether search engines, and now AI assistants, can crawl a site, understand it and trust it enough to show it. It covers crawl access, sitemaps, status codes, duplicate addresses, structured data, titles and descriptions, content and speed. Each finding should name the URL and the evidence, and the list should be in the order that unblocks the most. Run one free below.
Measured
What the scan measures for this
Crawl access and discovery
robots.txt per crawler, the sitemap and its children, and pages no sitemap declares.
Titles and descriptions
Whether the title and meta description say what the page is.
Structured data
The JSON-LD the page declares, and the identity fields it is missing.
AI crawlers
Whether GPTBot, ClaudeBot and PerplexityBot receive the same page as a browser.
For agents
What an agent is told about the same site
An agent does not read the report. It asks one endpoint before it reads, cites, connects or transacts, and gets a signed answer built from the same measurement.
2 · Call it
One endpoint
GET /api/v1/resolve?domain= returns the signed answer; preflight returns a decision and a receipt for one action.
3 · Check it
Without trusting us
Every answer is Ed25519-signed and logged; it verifies offline with the published key.
Workflow
The workflow
- Crawl accessIf a crawler is refused or the page is blocked in robots.txt, nothing else matters yet.
- Discovery and duplicationA sitemap that lists the right pages, one hostname, and one address per page.
- UnderstandingVisible text, structured data, titles and descriptions that say what each page is.
- Speed and experienceCore Web Vitals and mobile layout, once the page can be reached and read.
Free
Free tools for this
Each one is a single request to the domain you name, answered as text or a download. Put the domain on the end of the URL, or use the form on the tools page.
Run the free SEO auditA–F grade and a prioritised fix list.Technical SEO auditThe crawl, host, link and speed checks in detail.Test robots.txtWhat each named crawler may fetch.
Reading
Read next
Start from what you are checking
llms.txt auditdoes yours resolve, parse and match the site it describes?robots.txt for AI crawlerswhat yours actually permitsEntity map validatordoes your entitymap.json parse, and does every claim in it resolve?SEO audit toolthe technical checks, plus what AI crawlers actually receiveTechnical SEO auditcrawl access, sitemap, hosts, links and speed, checked in one scanLocal SEO auditdoes your site say who you are, where, and does every listing agree?SEO audit reports for agenciesyour name on the report, the proof still attachedWhat is a website auditWhat is a website audit? What it checks, what it costs, and how to run one freeAEO auditcan ChatGPT, Claude, Perplexity and Google reach, read and quote your site?
You cannot pay to improve a score. A licence adds the lists behind the counts and the record over time - never a better grade.
Questions about this page
QWhat is an SEO audit?
A review of the factors that decide whether search engines can crawl, understand and rank a site, producing a prioritised list of fixes with the URL and evidence for each.
QWhat should an SEO audit include?
Crawl access (robots.txt and status codes), discovery (sitemaps and internal links), duplication (hostnames, redirects, canonical URLs), structured data, titles and descriptions, content quality and speed. In 2026 it should also show what AI crawlers receive, because a site can rank in Google and still be refused by ChatGPT's crawler.
QHow do I do an SEO audit?
Run an automated scan, fix crawl access first, then discovery and duplication, then on-page understanding, then speed, and re-scan after each round to confirm the fix landed.
QWhich SEO audit tool should I use?
Semrush, Ahrefs, Screaming Frog and Moz all run deep site audits as part of paid suites or desktop software; WooRank and SEOptimer give quick one-page reports. CrawlCheck is free, needs no signup, and compares what each named search and AI crawler receives. CrawlCheck publishes this page.
QHow often should I run an SEO audit?
After every significant release and at least monthly. Most problems are introduced by a deploy, a plugin or a CDN setting rather than by content.