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SiteOne Crawler review (2026): is it any good?

Free open-source site crawler and audit report, as an app or CLI

FreeTechnical SEOChecked Oct 23, 2026 · graded Oct 23, 2026 by ToolGPA
Visit crawler.siteone.ioFree guide
SiteOne Crawler, as pictured on crawler.siteone.io
How SiteOne Crawler presents itself. Image from crawler.siteone.io.

Our verdict

Second of our top three technical SEO tools

For: Anyone who wants a full-site audit for free

SiteOne Crawler is a free, MIT-licensed crawler for Mac, Windows and Linux, as a desktop app or a single command-line binary. Each crawl ends in an HTML report scoring security, performance, SEO and accessibility from 0 to 10, covering tags, headings, redirects, 404s, security headers, SSL and caching, and it can fail CI builds or mirror a site. It is second because it shows nothing of how Google sees the site: it runs only on your own computer or server, with no hosted crawler or phone version, JavaScript sites need its optional browser mode, and AI help bills through your own API key.

See all three and how we rank

SiteOne Crawler report card

3.0GPA

Very good · out of 4.0 · graded Oct 23, 2026

Best for free site-wide audits from a desktop app or CLI

SiteOne Crawler is a free, MIT-licensed crawler for Mac, Windows and Linux that ends each crawl with an HTML report scoring security, performance, SEO and accessibility, and it can also mirror a site, export Markdown and fail CI builds. It only runs on your own machine, though: there's no hosted crawler, JavaScript sites need the optional browser mode, and the AI features bill through your own API key.

Who SiteOne Crawler is for

  • Fits if you want a whole-site audit report without paying for a licence
  • Works for developers adding a site quality gate to a CI pipeline

Who SiteOne Crawler is not for

  • Skip it if you want crawls run in the cloud, as it runs only on your own computer or server
  • Watch out: single-page apps are crawled only in the optional browser mode, which renders them in Chromium
  • Not for you if you want AI help with no bill elsewhere, as the assistant uses your own API key or a local model
  • Tight if you want reports emailed, which needs an SMTP server of your own
  • Watch out: the desktop app comes from the project's own links, not yet the Mac App Store or Microsoft Store
See the alternatives

Why SiteOne Crawler gets a 3.0

Five grades, each with its reason. The GPA is their average: an A is 4 points, an F is none.

  • AValue for moneyFree and open source under MIT: the desktop app, the command-line binary and hosted links for sharing reports. You download it and run it on your own computer, with no paid tier on record.
  • AFree plan and trialFree outright, with every feature included. The only costs are your own: an SMTP server if you want reports emailed, and an LLM provider's charges if you switch the AI assistant on.
  • CFeaturesSite-wide checks of SEO and OpenGraph tags, headings, redirects and 404s, security headers, SSL, caching and DNS, with a 0 to 10 score, CI gates and an offline mirror. The gaps: no hosted crawler, and no Search Console or analytics data on record.
  • BEase of useNo rating on record. The desktop app is a download you open and point at a site, and the CLI is a single binary with no runtime to install. JavaScript rendering is an extra mode you switch on.
  • CPlatforms and integrationsMac, Windows and Linux, with GitHub Actions, GitLab CI, Jenkins and your choice of OpenAI, Anthropic, Gemini or a local model. A program for computers only: no web or phone version.

What these grades rest on. Graded from this listing, whose facts were read from SiteOne's own pages on 23 October 2026. Not based on using the product, and shorter than our full reviews. How we review and grade.

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SiteOne Crawler: 3.0 GPA on ToolGPA

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<a href="https://toolgpa.com/tools/siteone-crawler#review"><img src="https://toolgpa.com/badge/siteone-crawler.svg" alt="SiteOne Crawler: 3.0 GPA on ToolGPA" width="196" height="56"></a>

Where SiteOne Crawler stands among technical SEO tools

SiteOne Crawler's GPA of 3.0 is higher than 73 of the 83 other technical SEO tools we grade, and level with 7.

It stands best on free plan and trial (A, above 62 of 83) and worst on platforms and integrations (C, above 3).

SiteOne Crawler has no paid plan.

On features, ease of use and platforms it scores 2.3 out of 4. Nothing scores higher for less, though at least one tool matches that score at a lower price.

Each grade against the category

Every bar is all 84 technical SEO tools we grade, cut by the letter each got. SiteOne Crawler’s own letter is outlined.

  • AValue for moneyAbove 54 of 83, level with 29
  • AFree plan and trialAbove 62 of 83, level with 21
  • CFeaturesAbove 10 of 83, level with 66
  • BEase of useAbove 62 of 83, level with 21
  • CPlatforms and integrationsAbove 3 of 83, level with 23

Price against what you get

Each dot is one of 73 technical SEO tools. Further left costs less, and higher up scores better on features, ease of use and platforms. Point at a dot to see which tool it is.

Features, ease of use and platforms, averaged

D1.0C2.0B3.0A4.0Free$2$5$10$20$50$100$200$500$1k$2k$5kMore for lessCosts more, scores moreCosts less, scores lessCosts more, scores lessSiteOne Crawler

What paid plans start at, a month (each step along is roughly double) →

  • The best score at each price
  • Has a free plan
  • No free plan
The full chart, and the best technical SEO tools at every price

Keep SiteOne Crawler, or make your own?

Keep it

SiteOne Crawler is free, so making your own would save you nothing.

And it is not the kind of software a weekend replaces. It is one of the better ones too: its GPA of 3.0 is higher than 73 of the 83 other technical SEO tools we grade.

What you could not

  • A crawler that checks every page of a site.
  • Apps for macOS, Windows and Linux that stay in step with each other.
  • It plugs into other products, GitHub Actions, GitLab CI and Jenkins among them.
  • AI features, unless you pay a model provider for each request yourself.

What this rests on. SiteOne Crawler’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.

What is SiteOne Crawler?

SiteOne Crawler is a free, MIT-licensed website crawler made by the web development company SiteOne and offered as a desktop app and as a single command-line binary. A crawl produces an HTML audit report with a 0 to 10 quality score across security, performance, SEO, accessibility and best practices. The same tool can mirror a site for offline use, convert it to Markdown, generate sitemaps, run load tests and fail CI builds on set thresholds.

Worth knowing

  • It runs on your own computer or server; there is no hosted crawler, and emailed reports need your own SMTP server.
  • The AI assistant uses your own API key or local model, so any LLM charges come from that provider.
  • Pages built by JavaScript are crawled only in the optional browser mode, which renders them in Chromium.
  • The desktop app is downloaded from the project's links; its page says it is not yet in the Mac App Store or Microsoft Store.

Key features

Audit report and quality score
Each crawl ends in a self-contained HTML report with a 0 to 10 score, weighted 25% security and 20% each for performance, SEO and accessibility.
Site-wide checks
Covers SEO and OpenGraph tags, headings, redirects and 404s, security headers, SSL/TLS certificates, caching headers, content types and DNS.
JavaScript rendering and screenshots
An optional browser mode renders each page in Chromium so single-page apps are crawled, and can capture every page as an image, GIF or MP4.
CI/CD quality gate
The --ci option fails a build when scores fall below set thresholds, with JUnit XML output and annotations for GitHub Actions.
Offline clone and Markdown export
Saves a static mirror of a whole site, assets included, or converts its pages to Markdown and an llms.txt file.
Optional AI assistant
With your own key for OpenAI, Anthropic or Gemini, or a local model, adds per-page SEO rewrites, spelling checks and a site summary.

SiteOne Crawler pricing

As of Oct 23, 2026, SiteOne Crawler is free to use.

Starts at
Free
Free plan
Free and open source under the MIT license: the desktop app, the command-line tool and online sharing of HTML reports.
Free trial
None listed
Free$0The desktop app and command-line crawler, run on your own computer, with free hosted links for sharing reports.

Read from crawler.siteone.io on Oct 23, 2026. Prices change, so confirm with SiteOne Crawler before you buy.

Pricing in detail

Works with

SiteOne Crawler alternatives

All SiteOne Crawler alternatives comparedAll technical SEO tools

Common questions

Does SiteOne Crawler have an Android app?

No Android app was listed when its pages were read on Oct 23, 2026. SiteOne Crawler is listed for macOS, Windows and Linux.

Does SiteOne Crawler have an iPhone app?

No iPhone app was listed when its pages were read on Oct 23, 2026. SiteOne Crawler is listed for macOS, Windows and Linux.

Is SiteOne Crawler open source?

Yes. SiteOne Crawler is open source, according to its own site.

Sources for this page

The prices, plans, platforms and features above were read from these pages on Oct 23, 2026.