Open SEO Crawler

Overview

Open SEO Crawler is a self-hosted, open-source crawler for technical site audits and competitor research. It best suits SEO professionals, developers, and site owners who want to inspect sites locally without account or per-URL billing. Its broad checks, configurable crawl and practical exports make it a capable free option, though you need to install and operate the software yourself.

Key features

The crawler checks titles, meta descriptions, H1s, canonicals, structured data, redirects, HTTP errors, indexability, hreflang, mobile viewports, mixed content, images, and security headers. That range makes it useful for spotting common technical issues and reviewing migrations in one crawl. It is focused on crawling and audits, rather than a full SEO suite.

It recognizes Shopify, WordPress, Webflow, Wix, Squarespace, Kajabi, Ghost, Drupal, HubSpot, and Joomla, then applies crawl recommendations for the detected CMS. This can make findings more relevant to the site being reviewed. Optional Playwright rendering handles JavaScript-heavy pages, and compare mode identifies content missing from raw HTML—a useful distinction when rendered output differs from the source.

Bulk reports export to XLSX, and sitemap export is also available. Defaults are 1,500 pages, five workers, a 0.4-second per-host delay, and depth 10; the page cap can be changed to unlimited. The README reports a 1,500-page WordPress crawl in under three minutes with five workers and the default delay. Treat that as a reference for that setup, not a promise for every site.

The crawler runs locally without accounts, telemetry, or API calls; it contacts the target site and checks GitHub for updates when requested. The MIT license and local operation suit users who value control over a hosted workflow, while installation and maintenance remain their responsibility. Installers are documented for Linux Mint, Ubuntu, Debian, macOS 11 or newer on Intel and Apple Silicon, and Windows 10/11. Bug reports go to GitHub Issues; other inquiries are directed to LinkedIn.

Pricing

Open SEO Crawler: free. The free, MIT-licensed self-hosted plan offers unlimited URLs with no account, API key, or per-URL billing. The default crawl is capped at 1,500 pages, but that cap can be set to unlimited. There is no free trial because the software is free.

Platforms

Open SEO Crawler supports Linux, macOS, Windows, self-hosted, and web. Installation is documented for Linux Mint/Ubuntu/Debian, macOS 11 or newer on Intel and Apple Silicon, and Windows 10/11.

Who it's for

Choose it for technical audits, migration checks, or competitor research when you want local crawling, broad technical checks, and the flexibility of unlimited URLs without billing per page. It is less suitable if you want a managed service: you will need to install and run the crawler, and JavaScript rendering is optional rather than the default workflow.

Pros and cons

• Pros: Unlimited URLs on a free, MIT-licensed plan avoid per-page charges.
• Pros: Checks span common technical SEO issues, with CMS-aware recommendations and optional JavaScript rendering.
• Pros: Local operation avoids accounts, telemetry, and API calls; XLSX reports and sitemap export support follow-up work.
• Cons: Self-hosting means setup and operation fall to the user.
• Cons: Default crawls stop at 1,500 pages unless the cap is changed, so larger audits require configuration.

Alternatives

For a free automated page-audit option, Lighthouse is an alternative; its platform coverage includes API, extension, Linux, macOS, web, and Windows.

A1 Website Analyzer may suit users who want a freemium option with a free trial and a continuing free mode capped at 500 page URLs and 500 imported URLs per website. Beam Us Up is another free crawler, with no limits stated for its plan and support for API, Linux, macOS, and Windows.

Checkbot offers a free Basic plan with 100 URLs per crawl, unlimited crawls and sites, and ads; consider it if that crawl cap fits your needs. Crab is a free, open-source alternative with no URL limits, for Linux, macOS, and Windows.

FreeCrawl offers a free plan with unlimited URLs and supports Linux, macOS, self-hosted, and Windows. Greenflare is a free, open-source option for Linux, macOS, and Windows. Netpeak Spider may fit users who want a freemium tool with a free trial; its free plan caps crawls at 500 URLs and supports Windows and macOS.

Browse more options in SEO Audit Software, SEO Crawler Software, and SEO tools.

Verdict

Open SEO Crawler is a strong fit for SEO professionals, developers, and site owners who want broad technical audits, local operation, and unlimited URL crawling at no cost. Its main advantage is control without per-URL billing; look elsewhere if you do not want to install and run a self-hosted tool.