Screaming Frog SEO Log File Analyser vs CrawlZilla

Screaming Frog SEO Log File Analyser7.9Visit CrawlZilla7.9Visit

Screaming Frog SEO Log File Analyser #3 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 Log File Analyser fits best

  Teams focused on server-log SEO analysis

• CrawlZilla fits best

  Large sites needing high crawl capacity

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Side by side

Feature	Screaming Frog SEO Log File Analyser 7.9/10 Visit ↗	CrawlZilla 7.9/10 Visit ↗
At a glance
Editor score	7.9	7.9
Ranking	#3 in Technical SEO Software	#5 in Technical SEO Software
Best for	Teams focused on server-log SEO analysis	Large sites needing high crawl capacity
Pricing model	Free plan + paid	Free plan + paid
Starting price	$139/user/yr	—
Free plan	✓	✓
Free trial	—	—
Deployment	Desktop	Cloud, Self-hosted
Platforms	Windows, macOS, Linux	Web
Support	Email, Tickets, Docs	Email, Community · 24/7
Built for	Solo, Small business, Mid-market	Solo, Small business, Mid-market, Enterprise
Features Screaming Frog SEO Log File Analyser 1/5 · CrawlZilla 4/5
Scheduled crawls	Not checked yet	✓ (best)
JavaScript rendering	Not checked yet	✓ (best)
Log-file analysis	✓ (best)	Not checked yet
Structured data audit	Not checked yet	✓ (best)
API access	Not checked yet	✓ (best)
Specs
Crawl limit	Not checked yet	100000 pages/crawl
Our review
Pros	Verifies search-engine bots and identifies spoofed bot IPs Finds errors, redirects, uncrawled URLs and orphan URLs Runs on Windows, macOS and Linux with CSV and Excel exports	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 is limited to 1,000 log events in one project It analyses imported logs rather than performing website crawls Its focus is specialized around server-log analysis	Integrations are absent Premium starts at £39.99 per month The product is available on web only
Our verdict	Screaming Frog SEO Log File Analyser is desktop software for SEOs who need to examine server logs and understand search-engine and AI-bot crawling. It imports Apache, W3C Extended, NGINX, IIS, JSON, CSV, TSV and Amazon Elastic Load… 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 Log File Analyser — where it wins

  • Verifies search-engine bots and identifies spoofed bot IPs
  • Finds errors, redirects, uncrawled URLs and orphan URLs
  • Runs on Windows, macOS and Linux with CSV and Excel exports

  Where it doesn't

  • The Free plan is limited to 1,000 log events in one project
  • It analyses imported logs rather than performing website crawls
  • Its focus is specialized around server-log analysis

• 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 Log File Analyser7.9/10 · Free plan

  A focused desktop analyser for verifying bots and understanding server-log crawl behavior.

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

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

  Visit CrawlZillaFull verdict →