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Crawl Lab

crawl-lab.com

Free plan Web
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Spec score 7.7 #10 of 27 in SEO Log File Analysis Tools

What it is

Crawl Lab is a free web toolbox for analyzing server logs and AI crawler activity. It accepts Apache and Nginx common or combined logs, including compressed.gz files, and reports crawled pages, crawl frequency, wasted crawl budget, and bot errors. The analyzer recognizes GPTBot, OAI-SearchBot, ClaudeBot, PerplexityBot, Google-Extended, Bytespider, Amazonbot, and other crawlers, checking their authenticity against official IP ranges. Processing occurs in the browser, so log files and IP addresses stay on your machine and are not uploaded or stored. No registration is required. Streaming reads allow analysis of several gigabytes or a full month of logs without a server-imposed size limit. Crawl Lab targets technical SEO practitioners concerned with SEO and generative-engine visibility. Its results show what crawlers fetched, not whether pages were indexed or how they rank. An llms.txt generator and AI citation audit are listed as coming soon. The free plan costs nothing, with no paid tier.

Spec sheet

Purpose
Crawl Lab is a free SEO toolbox for analyzing server logs and AI crawler activity.Read 30 Sep 2026 · crawl-lab.com
Audience
The product is aimed at technical SEO practitioners working on SEO and generative-engine visibility.Read 30 Sep 2026 · crawl-lab.com
Privacy
Crawl Lab describes the analyzer as RGPD-safe because files are not uploaded or stored.Read 30 Sep 2026 · crawl-lab.com
Headquarters
Quebec, CanadaRead 23 Sep 2026 · crawl-lab.com
AI crawlers
It detects GPTBot, OAI-SearchBot, ClaudeBot, PerplexityBot, Google-Extended, Bytespider, Amazonbot and other crawlers.Read 30 Sep 2026 · crawl-lab.com
Bot verification
The analyzer verifies crawler authenticity using official IP ranges.Read 30 Sep 2026 · crawl-lab.com
Crawl metrics
It reports crawled pages, crawl frequency, wasted crawl budget, and errors seen by bots.Read 30 Sep 2026 · crawl-lab.com
Limitations
Log analysis proves what crawlers fetched but does not show whether pages were indexed or how they rank.Read 30 Sep 2026 · crawl-lab.com
Local processing
All processing runs in the browser and log files and IP addresses never leave the user's machine.Read 30 Sep 2026 · crawl-lab.com
Log formats
The analyzer supports Apache and Nginx combined or common logs, including compressed .gz files.Read 30 Sep 2026 · crawl-lab.com
No account
The analyzer requires no registration or account.Read 30 Sep 2026 · crawl-lab.com
Scale
The tool reads files in streaming mode and can analyze several gigabytes or a full month of logs without a server-imposed size limit.Read 30 Sep 2026 · crawl-lab.com
Upcoming tools
Crawl Lab lists an llms.txt generator and an AI citation audit as coming soon.Read 30 Sep 2026 · crawl-lab.com

Plans and prices

Free Free no sign-up · no paid tier · no server-side size limit Read 30 Sep 2026 · crawl-lab.com

Every Crawl Lab plan and price →

Strong points and limits

Strong points

  • Runs entirely in the browser
  • Accepts Apache and Nginx logs, including .gz
  • Verifies crawlers using official IP ranges
  • Handles multi-gigabyte files without server size limits
  • Requires no registration or account

Limits

  • Does not show indexing status or rankings
  • Only upload is listed as an input method
  • Upcoming llms.txt and citation tools are not available yet

Who it suits

Crawl Lab suits technical SEO practitioners analyzing crawl behavior and generative-engine visibility. It is useful for users who need local, account-free log processing.

Verdict

Crawl Lab provides private, local analysis of conventional and AI crawler activity at no cost. Its reports describe fetching behavior, not search visibility outcomes.

Where Specifiction places it

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