Crab vs SiteOne Crawler

Crab7.9Visit SiteOne Crawler7.9Visit

Crab #5 in SEO Crawler Software 7.9/10 Free plan Free plan✓ 0 of 6 features Visit Crab

vs

SiteOne Crawler #6 in SEO Crawler Software 7.9/10 Free plan Free plan✓ 1 of 6 features Visit SiteOne

• Crab fits best

  Free users auditing JavaScript-heavy sites

• SiteOne Crawler fits best

  Developers needing open-source crawl QA

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Side by side

Feature	Crab 7.9/10 Visit ↗	SiteOne Crawler 7.9/10 Visit ↗
At a glance
Editor score	7.9	7.9
Ranking	#5 in SEO Crawler Software	#6 in SEO Crawler Software
Best for	Free users auditing JavaScript-heavy sites	Developers needing open-source crawl QA
Pricing model	Free	Free
Starting price	Free plan	Free
Free plan	✓	✓
Free trial	—	—
Deployment	Desktop	Desktop
Platforms	Windows, macOS, Linux	Windows, macOS, Linux
Support	Community	Docs
Built for	Solo, Small business	Solo, Small business, Mid-market
Features Crab 0/6 · SiteOne Crawler 1/6
JavaScript rendering	Not checked yet	Not checked yet
Scheduled crawls	Not checked yet	Not checked yet
Log-file analysis	Not checked yet	Not checked yet
Mobile crawling	Not checked yet	Not checked yet
Custom data extraction	Not checked yet	Not checked yet
API access	Not checked yet	✓ (best)
Specs
Crawl limit	Not checked yet	Not checked yet
Our review
Pros	Free crawling with no URL limits or subscriptions JavaScript rendering, hreflang, structured-data, and accessibility checks Recurring crawls, sitemap generation, and hierarchy visualization	Deep audits across SEO, performance, accessibility, security, and best practices JavaScript rendering, offline cloning, sitemap generation, and Markdown exports CI/CD quality gates with JUnit XML and GitHub annotations
Cons	Desktop-local workflow may not suit browser-based collaboration Focused on technical audits rather than a complete SEO suite Keyword research, rank tracking, and backlink analysis are outside its stated focus	Its broad audit scope may exceed the needs of SEO-only teams AI analysis is optional and requires a bring-your-own-LLM setup CLI and desktop interfaces may not suit browser-based workflows
Our verdict	Crab is a free desktop SEO crawler for technical site audits on Windows, macOS, and Linux. It crawls websites locally and is aimed at SEO professionals, students, solo founders, and others who need occasional or private audits. Its… Read the review →	SiteOne Crawler is a free, open-source website crawler for developers, DevOps teams, QA engineers, website owners, and SEO consultants. It crawls website pages and assets, then produces interactive HTML, text, and JSON reports covering… Read the review →

Strengths and trade-offs

• Crab — where it wins

  • Free crawling with no URL limits or subscriptions
  • JavaScript rendering, hreflang, structured-data, and accessibility checks
  • Recurring crawls, sitemap generation, and hierarchy visualization

  Where it doesn't

  • Desktop-local workflow may not suit browser-based collaboration
  • Focused on technical audits rather than a complete SEO suite
  • Keyword research, rank tracking, and backlink analysis are outside its stated focus

• SiteOne Crawler — where it wins

  • Deep audits across SEO, performance, accessibility, security, and best practices
  • JavaScript rendering, offline cloning, sitemap generation, and Markdown exports
  • CI/CD quality gates with JUnit XML and GitHub annotations

  Where it doesn't

  • Its broad audit scope may exceed the needs of SEO-only teams
  • AI analysis is optional and requires a bring-your-own-LLM setup
  • CLI and desktop interfaces may not suit browser-based workflows

• Crab7.9/10 · Free plan

  A free desktop crawler with unusually broad JavaScript-aware technical audits.

  Visit CrabFull verdict →
• SiteOne Crawler7.9/10 · Free plan

  A developer-focused crawler for deep audits, rendering, exports, and CI/CD quality gates.

  Visit SiteOneFull verdict →