# [The Rebilder scanner: a free AI visibility checker for any URL](https://rebilder.com/scan)

> Scan any public https URL for free, with no account: the scanner fetches it the way an agent does and the way a browser does, then scores the difference against the published Agent Readability Spec, showing every check and its evidence.

## What is an AI visibility checker?

An AI visibility checker fetches a page the way an AI assistant does and reports what came back. This one requests your URL as an agent and as a browser, compares the two responses, and scores the difference against the published Agent Readability Spec, so you can see which facts an assistant could reach and which it could not.

## Is the scan free, and do I need an account?

It is free and there is no account. Paste any public https URL and the result renders in the browser you ran it from.

## What does the score actually measure?

One hundred points across seven dimensions: retrievability, machine representation, fact coverage, fact position, structured data, contract and discovery, and evidence density. The same dimensions apply to every kind of page; only the expected facts change. Measured checks and heuristic ones are labelled separately wherever they appear.

## Can I scan a site I do not own?

Yes, and the result page for an unclaimed domain stays noindex. No domain enters the index, a ranking or a badge without verified owner opt-in, and removal stays free, self-serve and permanent. Our own comparison pages are the one surface that prints a scan of a named site without its opt-in, and every number there carries its scan date, its ruleset and a link where you can run the same scan yourself.

## How does the scanner identify itself?

It identifies as `rebilder-ars/0.2`, obeys `robots.txt`, keeps to a published request budget and never wears another crawler’s name. The full crawler policy and the opt-out are at [/bots](/bots).

## What do I do with a low score?

Every check shows the evidence it was scored from, so the result reads as a fix list rather than a grade, and the written fix for whichever check is costing you the most points is on the page for free. The rest of the written fixes unlock right on the result, as one page you can keep and share. The highest-leverage items are usually the same three: unblock the fetch, answer `Accept: text/markdown` with clean text, and move the facts an assistant is asked for to the front of the response.

## How it scores

One hundred points across seven dimensions — retrievability, machine representation, fact coverage, fact position, structured data, contract & discovery, and evidence density. The same dimensions apply to every page; only the expected facts change by page kind. Measured and heuristic checks are labeled as such wherever they appear.

## What scanning is not

Scanning is not publication. Nothing about a domain without verified owner opt-in is listed, ranked, badged, or indexed, and result pages for unclaimed domains carry noindex. The scanner identifies as rebilder-ars/0.2, obeys robots.txt, and never wears another crawler’s name.

## Related

- [The ARS specification](https://rebilder.com/spec/ars)
- [Crawler policy](https://rebilder.com/bots)