Screaming Frog SEO Spider vs CrawlZilla

Screaming Frog SEO Spider7.9Visit CrawlZilla7.9Visit

Screaming Frog SEO Spider #4 in Technical SEO Software 7.9/10 Free plan Free plan✓ 1 of 5 features Visit Screaming Frog

vs

CrawlZilla #5 in Technical SEO Software 7.9/10 Free plan Free plan✓ 4 of 5 features Visit CrawlZilla

• Screaming Frog SEO Spider fits best

  Technical SEO teams needing a mature crawler

• CrawlZilla fits best

  Large sites needing high crawl capacity

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Side by side

Feature	Screaming Frog SEO Spider 7.9/10 Visit ↗	CrawlZilla 7.9/10 Visit ↗
At a glance
Editor score	7.9	7.9
Ranking	#4 in Technical SEO Software	#5 in Technical SEO Software
Best for	Technical SEO teams needing a mature crawler	Large sites needing high crawl capacity
Pricing model	Free plan + paid	Free plan + paid
Starting price	—	—
Free plan	✓	✓
Free trial	—	—
Deployment	Desktop	Cloud, Self-hosted
Platforms	Windows, macOS, Linux	Web
Support	Email, Tickets, Phone, Docs	Email, Community · 24/7
Built for	Solo, Small business, Mid-market, Enterprise	Solo, Small business, Mid-market, Enterprise
Features Screaming Frog SEO Spider 1/5 · CrawlZilla 4/5
Scheduled crawls	Not checked yet	✓ (best)
JavaScript rendering	Not checked yet	✓ (best)
Log-file analysis	Not checked yet	Not checked yet
Structured data audit	Not checked yet	✓ (best)
API access	✓	✓
Specs
Crawl limit	Not checked yet	100000 pages/crawl
Our review
Pros	Crawls JavaScript websites with an integrated Chromium engine Combines technical audits, custom extraction, and crawl comparison Runs on Windows, macOS, and Linux with CLI operation	Crawls up to 10,000,000 URLs per crawl on Ultimate Audits 40+ SEO data points per URL Combines JavaScript, Lighthouse, hreflang, and structured-data audits
Cons	The Free plan limits each crawl to 500 URLs Advanced capabilities require a paid licence It is not a standalone keyword-rank tracking platform	Integrations are absent Premium starts at £39.99 per month The product is available on web only
Our verdict	Screaming Frog SEO Spider is a desktop crawler for technical SEO audits. It is aimed at SEO professionals, agencies, brands, and website owners that need detailed visibility into how sites are structured and rendered. Core audits cover… Read the review →	CrawlZilla is a browser-based technical SEO crawler for SEO professionals, agencies, developers, and businesses auditing websites at scale. It crawls HTML, images, JavaScript, CSS, and PDFs, reporting on more than 40 SEO data points per… Read the review →

Strengths and trade-offs

• Screaming Frog SEO Spider — where it wins

  • Crawls JavaScript websites with an integrated Chromium engine
  • Combines technical audits, custom extraction, and crawl comparison
  • Runs on Windows, macOS, and Linux with CLI operation

  Where it doesn't

  • The Free plan limits each crawl to 500 URLs
  • Advanced capabilities require a paid licence
  • It is not a standalone keyword-rank tracking platform

• CrawlZilla — where it wins

  • Crawls up to 10,000,000 URLs per crawl on Ultimate
  • Audits 40+ SEO data points per URL
  • Combines JavaScript, Lighthouse, hreflang, and structured-data audits

  Where it doesn't

  • Integrations are absent
  • Premium starts at £39.99 per month
  • The product is available on web only

• Screaming Frog SEO Spider7.9/10 · Free plan

  A mature crawler for deep technical audits, JavaScript sites, and repeatable reporting.

  Visit Screaming FrogFull verdict →
• CrawlZilla7.9/10 · Free plan

  A high-capacity crawler with deep technical audits, but no integrations.

  Visit CrawlZillaFull verdict →