SEO Essentials
Title, meta description, H1, canonical, indexability, mobile viewport — the fundamentals Google reads first, graded against best practice.
Free SEO checker · UK
Free SEO checker.
Find out why you aren’t ranking.
Paste any URL. Get an honest SEO score with 35+ checks — meta tags, indexability, schema, speed and AI-search readiness — plus a prioritised fix list. Plain English, about 10 seconds, no signup.
Free · No signup · Results in ~10 seconds
35+ checks per audit
~10s to full report
6 categories scored
£0 to start
What you get
Every ranking factor that matters,
checked in one pass.
Technical Health
robots.txt, XML sitemap, redirect chains, mixed content, hreflang, deprecated markup. The invisible problems silently capping your rankings.
Content Signals
Word count, heading hierarchy, image alt coverage, internal linking, text-to-code ratio — is your page substantial enough to compete?
Social & Schema
Open Graph, Twitter cards and JSON-LD structured data. Win rich results and stop your shared links looking like bare URLs.
Performance
Server response time, page weight, compression, render-blocking scripts, modern image formats. Speed is a ranking factor — know yours.
AI search (AEO / GEO)
llms.txt, AI crawler access, FAQ structure and entity markup — the signals ChatGPT, Perplexity and Google AI Overviews actually use to cite you.
Free tools
Run one check, or the full audit.
Every lander below uses the live crawler. Start with the checker that matches the problem, then fix the rest from the full report.
Free SEO Checker
Full on-page, technical and AI-search audit. Score out of 100.
AEO / GEO Checker
AI Overviews, ChatGPT and Perplexity citation readiness.
llms.txt Checker
Detect a missing or empty /llms.txt at your domain root.
XML Sitemap Checker
Find a missing sitemap.xml or a robots.txt that never declares it.
noindex Checker
Catch a noindex tag before it wipes a launch.
Meta Tag Checker
Title, description, robots and viewport in one pass.
How we compare
Built for people who bounced off the £100 suites.
| Capability | SEO King | SEOptimer | Seobility |
|---|---|---|---|
| Instant URL audit | Yes · ~10s | Yes | Yes |
| No-signup first scan | Yes | Limited | Daily cap |
| AI search / AEO checks | Yes | Yes | Mentioned |
| White-label PDF | Not yet | Yes | Paid |
| Rank + backlink suite | No — audits only | Paid add-ons | Paid suite |
| Starting price | £9/mo | From ~$19/mo | From $50/mo |
Honest trade-off: they sell agency reporting. We sell a fast, readable score and a fix list. See all comparisons — SEOptimer, Seobility, Sitechecker.
How it works
Three steps to the throne.
- Paste your URL. Or a competitor’s — we audit any public page.
- We crawl it live. 35+ checks across essentials, content, technical, social, speed and AI search.
- Fix what matters. A scored, prioritised list tells you exactly where the traffic is leaking.
Questions
Frequently asked.
Is the SEO audit really free?
Yes. Run instant audits with no signup. Create a free account to unlock the full detailed report and keep your audit history. Pro removes all limits.
What does the audit check?
Over 35 factors across six areas: SEO essentials (title, meta description, indexability, canonical), content quality, technical health (robots.txt, sitemap, redirects, mixed content, hreflang), social and schema markup, performance (server speed, page weight, compression), and AI search readiness (llms.txt, AEO/GEO signals, AI crawler access).
How long does an audit take?
Usually under 10 seconds. We fetch your page live, run every check, and score it out of 100 with a letter grade — plus a prioritised fix list.
Do I need technical skills to use the results?
No. Every issue comes with a plain-English explanation of what it is, why it matters for your rankings, and exactly how to fix it.
Can I audit my competitors?
Absolutely. Audit any public website — see exactly where competitors are weak and beat them where it counts.
Is this the Shopify app called SEO King?
No. This is seo-king.co.uk — a standalone website SEO checker for any public URL. We are not affiliated with the Shopify app at seoking.ai.
Do you check AI search / AEO / GEO?
Yes. Every audit now flags llms.txt, whether AI crawlers are blocked in robots.txt, FAQ/question structure, and Organization/Person markup that citation engines look for.
Guides
Learn the fixes, not just the score.
Crawled — Currently Not Indexed: What It Means and How to Fix It
Crawled is not indexed. Google fetched the page, decided it was not worth listing, and moved on. That is a quality and uniqueness problem more often than a robots problem.
Read guide →
noindex vs robots.txt: Which One Actually Keeps a Page Out of Google?
They sound like twins. They are not. Mix them up and you get the famous “No information is available for this page” result — listed, and useless.
Read guide →
XML Sitemaps: What to Include, What to Leave Out, How to Check
Most sitemaps are either missing or stuffed with junk. Either way they fail at the only job they have: pointing crawlers at the URLs that matter.
Read guide →Your competitors already know their score.
Free · No signup · Results in ~10 seconds