Technical SEO & Site Audits
Open-source technical SEO tools
8 of the 84 technical SEO tools in this directory are open source, according to their own sites.
All of them are free or have a free plan.
Listings checked up to Oct 23, 2026 · Where the facts come from
| Tool | Price | Free plan | Runs on |
|---|---|---|---|
| sitespeed.ioFree open-source toolkit for testing and monitoring web performance | Free | Free | macOS, Windows, Linux |
| UnlighthouseFree open-source tool that runs Lighthouse on every page of a site | Free | Free | macOS, Windows, Linux |
| LighthouseGoogle's open-source audit of page speed, accessibility and SEO | Free | Free | Web, Browser extension |
| Yellow Lab ToolsFree open-source audit of a page's speed and front-end code | Free | Free | Web, macOS, Linux |
| SiteOne CrawlerFree open-source site crawler and audit report, as an app or CLI | Free | Free | macOS, Windows, Linux |
| SEOnautOpen-source SEO site audit tool, self-hosted or in the cloud | Free plan · from $9/mo | Yes | Web |
| LibreCrawlFree open-source SEO crawler you run in your own browser | Free | Free | Web, macOS, Windows, Linux |
| squirrelscanOpen-source site audit CLI whose fixes are written for coding agents | Free plan · from $19/mo | Yes | Web, macOS, Windows, Linux |
Common questions
Which technical SEO tools are open source?
8 of the 84 technical SEO tools in this directory are open source, according to their own sites. They are sitespeed.io, Unlighthouse, Lighthouse, Yellow Lab Tools, SiteOne Crawler, SEOnaut, LibreCrawl and squirrelscan.
When was this checked?
Every listing on this page was checked on Oct 23, 2026, against the pages it cites. Vendors change prices and plans without notice, so confirm on their site before you buy.
This page is built from the listings. A tool is here because its listing says so, and each listing names the pages it was read from.