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There is no single best free SEO audit tool. The right choice depends on whether you need a five-minute health check, a deep technical crawl, or real Search Console data. This comparison covers what each free tool actually checks and where it stops. (Full disclosure: we build one of the tools on this list – the comparisons stay honest.)
US search visibility and measured page experience
In the latest complete latest visibility window, 277 US impressions and 0 US clicks were recorded for this URL, with an aggregate US average position of 46.8. This is a dated visibility signal, not a PageSpeed score for this specific URL and not proof of a lead, sale, or revenue outcome.
Open the live PageSpeed mobile test → · Run our Website SEO Audit →
Open the live PageSpeed mobile test → · Read our dated case study →
Why it matters here: US search visibility makes page selection and page experience worth measuring together. The homepage benchmarks are evidence for the broader technical-performance report; they are not a substitute for testing this URL under the same conditions.
Read the dated PageSpeed report and screenshots → · See the audit methodology →
Quick comparison
| Tool | Signup | Best for | Free-tier limit |
|---|---|---|---|
| GSA free website audit | No | Quick prioritised on-page + technical audit | 5 pages per scan |
| Google Search Console | Yes (verify) | Indexing and real search data | Own site only |
| Google PageSpeed Insights | No | Core Web Vitals | One page at a time |
| Ahrefs Webmaster Tools | Yes (verify) | Technical audit + backlinks for your site | Verified sites only |
| Screaming Frog (free) | Desktop app | Deep technical crawl | 500 URLs |
| Seobility | Yes | Ongoing monitoring | 1,000 pages, capped features |
| Sitechecker | Yes | Site-wide crawl + monitoring | Capped checks |
| SEOptimer | No | Fast first-look report / white-label PDF | Depth and frequency capped |
What to look for in a free SEO audit tool
- Prioritisation, not a warning dump. A list of 200 issues is useless. You want the few that matter first.
- Coverage. Metadata, headings, content depth, internal links, images, indexability and speed.
- No signup friction. If a tool gates the basics, you will never get through it.
- Honesty. No tool can promise rankings.
The tools in detail
GSA free website audit
A no-signup checker that samples up to five public pages and returns a prioritised list across metadata, headings, content, internal links, image alt text, indexability and PageSpeed. Best for a fast, actionable first look. Limit: a sample, not a full crawl.
Google Search Console
Essential and free, but it shows your site only and requires verification. Use it for indexation, Core Web Vitals field data and real queries. See our guide on how to run an SEO audit.
Google PageSpeed Insights
The authoritative source for LCP, CLS and INP. One page at a time.
Ahrefs Webmaster Tools
Free for verified sites: site audit plus backlink data. The best free option once you want link context.
Screaming Frog (free tier)
Industry-standard crawler, free up to 500 URLs. Technical depth, steeper learning curve.
Seobility / Sitechecker
Solid ongoing monitoring with capped free tiers.
SEOptimer
Fast on-screen audit and a white-label PDF; the free tier caps depth and frequency.
When free is not enough
How to choose (by job, not by logo)
Quick diagnosis
You want to know what is broken now. Start with a no-signup audit – GSA Website Audit – and work down the 40-point checklist.
Your own query data
You want to see the terms and pages Google already shows. Google Search Console, verified – always.
Core Web Vitals
You want speed truth. PageSpeed Insights for the lab test and Search Console for field data.
Backlinks on your site
You want your own link profile. Ahrefs Webmaster Tools (free, verified).
A deep technical crawl
You want every URL, not a sample. Screaming Frog, free to 500 URLs.
Ongoing monitoring
You want alerts when things change. Seobility or Sitechecker on their capped free tiers.
A free stack that actually covers a site
You rarely need one tool. A practical free stack: GSA Website Audit for the prioritised diagnosis, Google Search Console for query and indexing truth, PageSpeed Insights for speed, and Screaming Frog when you outgrow a five-page sample. Together they cover diagnosis end to end – for nothing.
Where free tools stop
Free tools diagnose. They do not prioritise by commercial value, write the fixes, or implement them. When you have the list and want it done, that is SEO audit services or a content refresh.
Related reading
- How to run an SEO audit – the full method, start to finish.
- SEO audit checklist (40 checks) – the manual pass.
- Best free SEO audit tools (2026) – the free shortlist.
- SEO audit services – when you want the fixes done.
- Free website SEO audit – run one on your site in 30 seconds.
Frequently asked questions
What is the best free SEO audit tool?
Can a free SEO audit tool rank my site?
Do I need more than one tool?
Are free SEO tools safe?
Is there a free tool that checks AI readiness?
What should I fix first?
Sources
Run a free SEO audit
No signup. Up to 5 pages, technical and on-page, prioritised in under a minute.