A GEO audit reads your site the way ChatGPT, Claude and Perplexity do: it checks whether their crawlers can reach you, whether your content survives without JavaScript, and whether there is a clean passage worth quoting. Brimm runs one free and shows the exact blockers. No email.
free / no email / ~30s
Generative engine optimization starts with one blunt question: when an AI assistant goes looking, does it find anything it can use? Every check runs on a real fetch of your site, never on guesses.
Check whether your robots.txt blocks OpenAI's crawlers and whether your host returns errors to them. OpenAI uses different crawlers for different jobs: GPTBot gathers training data, while its search crawler fetches pages to answer live questions. Blocking one is not blocking the other. The audit tests your robots.txt against the real crawler names and reports exactly who is locked out, then fetches as those bots to confirm.
Not by itself. GPTBot is the training crawler. If you block it but allow the search crawler, ChatGPT can still cite you when it browses for an answer. Many owners block everything in one angry line and accidentally remove themselves from AI results that were sending them customers. The audit shows you which rule does what.
No. Google has publicly said it does not use llms.txt, and no major engine documents it as a requirement. Some AI tools do read it, so we check for it and score it as the optional experiment it is. Any tool that fails you outright for a missing llms.txt is scoring folklore, not fact.
The boring fundamentals, verified: the crawler can reach the page, the content is in the HTML rather than rendered by JavaScript, the page contains self-contained passages that answer a question, and the source is attributable. Published research on generative engines adds that concrete statistics, quotations and cited sources raise the odds of being referenced. None of it works if the crawler is blocked at the door, which is why the audit checks access first.
An SEO audit asks whether Google's index can rank you. A GEO audit asks whether AI assistants can find, read and quote you. They overlap on the fundamentals and diverge on the details, which is why the full Brimm audit scores both, plus AEO, from one scan of 44 checks.
Most free SEO checkers cap your scans, take your email, then blur half the report. Brimm's free scan is the diagnosis: full score, every gate failure, your worst problems, on screen, no address taken. We make money on the watching and the fixes, not your inbox. Every check is grounded in official search-engine documentation, and the full list of 44 is on the front page.