Crawl Lab is a free web-based SEO toolbox for examining server logs and crawler activity, including visits from AI bots. 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. It recognizes crawlers such as GPTBot, OAI-SearchBot, ClaudeBot, PerplexityBot, Google-Extended, Bytespider and Amazonbot, and checks crawler authenticity against official IP ranges. Analysis runs in the browser; log files and IP addresses stay on the user’s machine and are not uploaded or stored. No registration is required. Streaming processing can handle several gigabytes or a full month of logs without a server-imposed size limit. The tool is aimed at technical SEO practitioners working on search and generative-engine visibility. Its findings show what crawlers fetched, but do not establish whether pages were indexed or how they rank. An llms.txt generator and an AI citation audit are listed as coming soon.
Who it is for
Crawl Lab suits technical SEO practitioners who want to examine server logs and AI crawler activity locally. It can help describe crawler fetches, but not determine indexing or rankings.
What is good
- Free to use with no account required.
- Accepts Apache and Nginx logs, including .gz files.
- Verifies crawler authenticity using official IP ranges.
- Log files and IP addresses stay on the user's machine.
- Streaming analysis handles several gigabytes of logs.
What to know first
- Results do not show whether pages were indexed.
- Results do not show how pages rank.
- The llms.txt generator and AI citation audit are coming soon.
Verdict
Crawl Lab offers local log analysis and crawler identification at no cost. Its output concerns what bots fetched, not indexing or ranking outcomes.
Get started with Crawl Lab
- Open the Crawl Lab website.
- Choose a supported Apache or Nginx log file, including a compressed .gz file if needed.
- Upload the log file for analysis in the browser.
What the free plan stops at
The Free plan has no paid tier or server-imposed size limit. Log analysis shows what crawlers fetched, but not whether pages were indexed or how they rank.
Questions about Crawl Lab
How much does Crawl Lab cost?
The Free plan costs 0.00 USD per free, and Crawl Lab lists no paid tier.
Does Crawl Lab require an account?
No. The analyzer requires no registration or account.
Which log formats can it analyze?
It supports Apache and Nginx combined or common logs, including compressed .gz files.
Are log files uploaded to Crawl Lab?
No. Processing runs in the browser, and log files and IP addresses stay on the user's machine rather than being uploaded or stored.
Does Crawl Lab show whether pages are indexed or their rankings?
No. Its log analysis shows what crawlers fetched, but not whether pages were indexed or how they rank.
What tools are coming soon?
Crawl Lab lists an llms.txt generator and an AI citation audit as coming soon.
Crawl Lab plans and pricing
All plansCompared on SEO log file analysis tools
- Free plan
- Yes
- Log input methods
- upload
- Crawler segmentation
- Yes
- Crawl waste reports
- Yes
