Which free tools check a website for speed, broken links and sitemap problems?
checked 2026-10-08 5 entries from the Tools Atlas
By Tori, last checked 2026-10-08. Each entry below was read against its own page or licence. The verdicts are written for someone who wants to use a tool in something they sell or publish; a skip is often about a licence or a heavy setup, not about quality.
At a glance
| Name | Licence | Cost | Rules check | Atlas verdict |
|---|---|---|---|---|
| PageSpeed Insights | not stated | Free software. | Allowed | Use it |
| Unlighthouse | MIT | Free software. | Allowed | Use it |
| advertools | MIT | Free software. | Allowed | Use it |
| SEOnaut | MIT | Free software. | Allowed | Copy the idea, skip the tool |
| Six checks before you publish many pages | MIT | Free software. | Allowed | Copy the idea, skip the tool |
One by one
PageSpeed Insights Use it
Asks Google how fast and how easy to use a public page is on a phone. An official connection that works without a key for a few checks.
Licence. not stated. Cost. Free software.
- Source page, read 2026-10-08
Unlighthouse Use it
Runs Google's Lighthouse over every page of a site and reports speed and accessibility. MIT. Useful once the site is live; low priority before that.
Licence. MIT. Cost. Free software.
- Source page, read 2026-10-08
advertools Use it
A Python crawler plus readers for robots.txt and sitemap files, for checking your own site from your own computer. MIT. Needs no server. Respect robots.txt on any site that is not yours.
Licence. MIT. Cost. Free software.
- Source page, read 2026-10-08
SEOnaut Copy the idea, skip the tool
Crawls a site and lists problems by severity: broken links, redirects, missing or duplicate titles, heading order. MIT. It needs Docker and MySQL and has only a web screen, so copy its list of problems into a small check of your own instead.
Licence. MIT. Cost. Free software.
- Source page, read 2026-10-08
Six checks before you publish many pages Copy the idea, skip the tool
Six checks to pass before publishing a batch of pages: enough words that are unique to each page, no missing data, no near-duplicates, noindex pages kept out of the sitemap, one address per page, and no page that nothing links to.
Licence. MIT. Cost. Free software.
- Source page, read 2026-10-08
Why the six checks matter
Google's spam policy treats many pages made mainly to rank as scaled content abuse, whether a person or a machine wrote them. The six checks catch the usual causes: thin pages, copies of each other and pages nobody can reach.
The repository the checks come from has no production use, so the list is worth copying and the code is not worth depending on.
Questions
Is PageSpeed Insights free?
Yes. It is Google's free page speed check, and it works without a key for a few checks.
What is the difference between PageSpeed Insights and Unlighthouse?
PageSpeed Insights checks one page at a time on Google's side. Unlighthouse runs Lighthouse over every page of your site.
What is scaled content abuse?
Google's term for many pages made mainly to rank, whoever or whatever wrote them.
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