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Crawl Lab
Quebec, Canada
What it is
Crawl Lab is a free web-based toolbox for examining 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. It detects AI crawlers including GPTBot, OAI-SearchBot, ClaudeBot, PerplexityBot, Google-Extended, Bytespider, and Amazonbot, and checks crawler authenticity against official IP ranges. Processing takes place in the browser, so log files and IP addresses stay on the user's machine; files are not uploaded or stored, and no account is required. Streaming mode can handle several gigabytes or a full month of logs without a server-imposed size limit. Crawl Lab is aimed at technical SEO practitioners working on search and generative-engine visibility. Its analysis can show what crawlers fetched, but not whether pages were indexed or how they rank. An llms.txt generator and AI citation audit are listed as coming soon.
For and against
For
- Free, with no account required
- Processes logs in the browser
- Accepts compressed .gz files
- Verifies crawlers against official IP ranges
- Can analyze several gigabytes of logs
Against
- Log analysis does not show whether pages were indexed
- Log analysis does not show page rankings
- Two additional tools are listed as coming soon
The verdict
Crawl Lab provides local log analysis with crawler-specific reporting and no account requirement. Its results describe crawler fetching, not indexing or ranking outcomes.
Who it suits
Crawl Lab suits technical SEO practitioners who want to inspect server logs and AI crawler visits. It may also help those tracking visibility in generative engines, while not answering indexing or ranking questions.
Plans and prices
Free
no sign-up · no paid tier · no server-side size limit
Read 30 Sep 2026 · crawl-lab.com
On the record
- AI crawlers
- It detects GPTBot, OAI-SearchBot, ClaudeBot, PerplexityBot, Google-Extended, Bytespider, Amazonbot and other crawlers.crawl-lab.com · read 30 Sep 2026
- Audience
- The product is aimed at technical SEO practitioners working on SEO and generative-engine visibility.crawl-lab.com · read 30 Sep 2026
- Bot verification
- The analyzer verifies crawler authenticity using official IP ranges.crawl-lab.com · read 30 Sep 2026
- Crawl metrics
- It reports crawled pages, crawl frequency, wasted crawl budget, and errors seen by bots.crawl-lab.com · read 30 Sep 2026
- Limitations
- Log analysis proves what crawlers fetched but does not show whether pages were indexed or how they rank.crawl-lab.com · read 30 Sep 2026
- Local processing
- All processing runs in the browser and log files and IP addresses never leave the user's machine.crawl-lab.com · read 30 Sep 2026
- Log formats
- The analyzer supports Apache and Nginx combined or common logs, including compressed .gz files.crawl-lab.com · read 30 Sep 2026
- No account
- The analyzer requires no registration or account.crawl-lab.com · read 30 Sep 2026
- Privacy
- Crawl Lab describes the analyzer as RGPD-safe because files are not uploaded or stored.crawl-lab.com · read 30 Sep 2026
- Purpose
- Crawl Lab is a free SEO toolbox for analyzing server logs and AI crawler activity.crawl-lab.com · read 30 Sep 2026
- 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.crawl-lab.com · read 30 Sep 2026
- Upcoming tools
- Crawl Lab lists an llms.txt generator and an AI citation audit as coming soon.crawl-lab.com · read 30 Sep 2026
