# AI visibility check: can AI assistants read your site?

> Type in your address. We read the page and the files meant for machines the way any crawler reads them, and in about ten seconds you see whether ChatGPT, Claude and Perplexity can read you and tell who you are.

## What we check

We read the page and three public files meant for machines (robots.txt, the sitemap and llms.txt), the way any crawler reads them. We do not ask an assistant: one answer is one random sample. We check what decides whether it can cite you at all.

## What people ask

### What is AI visibility?

Whether ChatGPT, Claude, Perplexity and the other assistants can read your site, tell which business it is and name it in an answer. The first part depends on robots.txt and on the text in the HTML. The second depends on clear facts about the business, on your site and on other sites.

### How does ChatGPT decide which businesses to recommend?

The exact rule is not public, but three things are plain. An assistant only recommends sites it can read. It prefers pages with clear facts: name, address, phone, services. And it trusts a business that other sites mention: in an Ahrefs study of 75,000 brands, mentions were the strongest link to showing up in AI answers.

### Should I block GPTBot?

That is your choice. GPTBot collects text to train future OpenAI models. Blocking it does not take your site out of ChatGPT: search goes through OAI-SearchBot, and opening a page because a person asked goes through ChatGPT-User. If you want to be cited, do not block those two.

### What is llms.txt, and do I need one?

A text file at the root of a site that tells language models which pages matter and what is in them. It is optional and not a standard: Google says it does not use it, and some assistants and agents read it. It costs little, but robots.txt and the text of your pages count for more. This page runs an llms.txt check too: you see whether the file is there, and whether it is text rather than an HTML page.

### Why don’t you just ask ChatGPT?

Because one answer is one random sample. Ask the same question a minute later, or as someone else, and you get a different list. We check what decides whether an assistant can cite you at all, and what you can change.

### Does structured data help?

It helps machines tell who you are without guessing: your name, address, phone and profiles sit in one block they read directly. Google says it is not required for AI search; Microsoft says it helps its models understand content. Without it, an assistant has only your text and other people’s sites to go on.

Page: https://tnb-tech.com/en/ai-visibility-check/