Free tools

Free website checks. No sign-up.

Quick, honest answers about websites, crawlers and campaigns. Type an address or paste some text, get a result in seconds. We do not keep a record of what you check.

Check a website

01 Analytics checker

What does a website track?

See which analytics, tag managers, recording tools, ad pixels and cookie banners a site loads, including tools inside its Google Tag Manager.

Open the tool 02 AI crawler checker

Can ChatGPT and Claude read your site?

See which AI crawlers a site's robots.txt allows or blocks, what each choice means, and copy a ready-made block.

Open the tool 03 llms.txt generator

Is your site ready for AI assistants?

Draft an llms.txt from your sitemap, or check an existing one against the format.

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AI crawlers and bots

04 AI crawler log analyzer

Which AI bots actually visit you?

Drop in your server access log and see every AI crawler visit, by bot, page and day. The log never leaves your browser.

Open the tool 05 Crawler IP verifier

Is it really GPTBot or Googlebot?

Check an IP address against the ranges crawler operators publish and their reverse DNS, to catch bots faking a famous name.

Open the tool 06 robots.txt tester

Is this URL blocked for a crawler?

Test any path against any crawler and see the exact rule that decides it, on a live site or a draft.

Open the tool 07 User agent lookup

Bot, AI crawler or person?

Paste a user-agent string to see what kind of visitor it claims to be, with browser, device and system.

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Plan and measure

08 A/B test calculator

Is the difference real?

Compare conversion rates of two versions or two periods and get a plain answer, with confidence and the sample size you need.

Open the tool 09 UTM builder

Will this campaign link report correctly?

Build tagged links, catch mistakes like capital letters and odd mediums, and see the channel each visit will land in.

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These tools look only at what a website publishes to everyone (its pages, robots.txt, sitemap and llms.txt) or at what you paste in. They cannot see private data, and they do not estimate anyone's traffic: only a site's own analytics knows that.

Measure your own site properly.

Visitors, sources, AI traffic and AI crawlers, explained in plain words every morning. 30 days free.

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