Free tools

Free tools for how AI sees your site

Six small tools, each answering one question: can AI robots get in, do they find any text, does the page say who you are, and do you see the visits that come back. No signup, no email, no cookie, and the addresses you check are not stored.

• AI Crawler Checker Whether robots.txt and your firewall let ChatGPT, Claude, Perplexity and Google's AI read the site, with search robots and training robots told apart. Your site
• JavaScript Content Checker What a robot that does not run JavaScript finds on a page: words, headings, links and the first 500 characters. One page
• Schema Markup Checker Which schema.org types a page carries in JSON-LD, Microdata and RDFa, which blocks are broken and which key fields are empty. One page
• llms.txt Generator A draft llms.txt built from your home page and up to ten pages, with gaps marked instead of invented. Your site
• llms.txt Checker Whether an existing llms.txt follows the format and whether its links still lead anywhere. Your site
• GA4 AI Traffic Regex A regular expression and the exact clicks to give visits from ChatGPT and other assistants their own line in Google Analytics 4. Runs in your browser

Each tool checks one thing. The free check reads the whole picture.

A site can pass every tool here and still be left out of the answer: ChatGPT leans on what other sites say about a business, not only on its own pages. The free OperStack check reads your site the way an assistant does, scores it out of 100, and asks ChatGPT the questions your buyers ask to see whether it names you or someone else.

Run the free AI visibility check →

What the data says

In our study of 731 websites (September to October 2026), ChatGPT did not name 66% of businesses in any of 3 buyer questions, and 28% of sites had good classic SEO but weak AI readiness. Sites with an llms.txt were named no more often than sites without one (32% against 36%). The tools above fix the readable part; the study shows why that part alone is not enough.

Where to start

1. AI Crawler Checker: if search robots are blocked, nothing else matters yet.
2. JavaScript Content Checker on your home page and one service page.
3. Schema Markup Checker on your home page, for Organization or LocalBusiness.
4. GA4 AI Traffic Regex, so you can see whether any of it changes the visits.

Built by Maksim Shchegolev, founder of OperStack. None of these tools calls an AI model or a paid service: they read public pages, or run in your browser.