Crawl Lab

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Score6.7

Rank#6 of 27

PriceFree

Free planYes

Runs onWeb

Summary

Crawl Lab is a free, browser-based SEO 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 errors seen by bots. It detects AI crawlers such as GPTBot, OAI-SearchBot, ClaudeBot, PerplexityBot, Google-Extended, Bytespider and Amazonbot, and verifies crawler authenticity against official IP ranges. Processing runs locally in the browser: log files and IP addresses do not leave the user’s machine, and files are not uploaded or stored. No account is required. Streaming file processing allows analysis of several gigabytes or a full month of logs without a server-imposed size limit. Crawl Lab is aimed at technical SEO practitioners working on SEO and generative-engine visibility. Its analysis indicates what crawlers fetched, but does not show 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 analyzing site crawl activity and AI crawler visits. It is useful for users who want to inspect logs locally without creating an account.

What is good

Free with no paid tier
Processes logs in the browser
Accepts compressed .gz log files
Verifies crawlers against official IP ranges
No server-imposed file size limit

What to know first

Does not show whether pages were indexed
Does not report how pages rank
Listed upcoming tools are not yet available

Verdict

Crawl Lab focuses on what bots fetched from server logs, with local processing and no account requirement. Its results do not establish indexing or ranking, so it addresses crawl activity rather than those outcomes.

Crawl Lab plans and pricing

All plans

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

Compared on SEO log file analysis tools

Free plan: Yescrawl-lab.com
Log input methods: uploadcrawl-lab.com
Crawler segmentation: Yescrawl-lab.com
Crawl waste reports: Yescrawl-lab.com

Facts

Purpose: Crawl Lab is a free SEO toolbox for analyzing server logs and AI crawler activity.crawl-lab.com · 30 Sept 2026
Log formats: The analyzer supports Apache and Nginx combined or common logs, including compressed .gz files.crawl-lab.com · 30 Sept 2026
Crawl metrics: It reports crawled pages, crawl frequency, wasted crawl budget, and errors seen by bots.crawl-lab.com · 30 Sept 2026
AI crawlers: It detects GPTBot, OAI-SearchBot, ClaudeBot, PerplexityBot, Google-Extended, Bytespider, Amazonbot and other crawlers.crawl-lab.com · 30 Sept 2026
Bot verification: The analyzer verifies crawler authenticity using official IP ranges.crawl-lab.com · 30 Sept 2026
Local processing: All processing runs in the browser and log files and IP addresses never leave the user's machine.crawl-lab.com · 30 Sept 2026
Privacy: Crawl Lab describes the analyzer as RGPD-safe because files are not uploaded or stored.crawl-lab.com · 30 Sept 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 · 30 Sept 2026
No account: The analyzer requires no registration or account.crawl-lab.com · 30 Sept 2026
Audience: The product is aimed at technical SEO practitioners working on SEO and generative-engine visibility.crawl-lab.com · 30 Sept 2026
Upcoming tools: Crawl Lab lists an llms.txt generator and an AI citation audit as coming soon.crawl-lab.com · 30 Sept 2026
Limitations: Log analysis proves what crawlers fetched but does not show whether pages were indexed or how they rank.crawl-lab.com · 30 Sept 2026