A real category of free, no signup AI visibility checkers has formed over the past year, tools that scan a website and score how likely it is to get cited by ChatGPT, Perplexity, Gemini, and Google AI Overviews. They are not all built the same way. Some check a handful of technical signals in seconds, others run a much deeper scan. Here is what each one actually does, ours included.
What these tools actually check
Every checker in this category is looking for some combination of the same underlying signals: whether AI crawlers are blocked in robots.txt, whether an llms.txt file exists, whether the page has structured data and schema markup, how the content is formatted for extraction, and how the site performs when a rendering engine tries to read it the way an AI crawler would. The differences are in depth and honesty about what a free scan can and cannot prove.
| Tool | Signals checked | Signup | What makes it different |
|---|---|---|---|
| Omni AI Visibility Scan | 8 technical and content checks | None | Built directly into a managed AEO service, the scan is the entry point, not the end product, we fix what it finds |
| BlueGrid Media | 43 automated + an 11 signal manual deep audit | None | Fetches the live page, robots.txt, llms.txt, and sitemap.xml directly through a read only proxy, nothing stored |
| Ahrefs | Technical crawl signals | None | Backed by Ahrefs' own crawl index, strongest on backlink and domain authority context |
| Frase | Content structure signals | Free account | Leans toward content formatting and EEAT style signals over technical crawl access |
| PromptRush | Third party mention signals | None for the first check | Focused specifically on earned mentions across review sites, listicles, and Reddit, the sources AI already cites |
The most thorough of the group
BlueGrid Media's checker is the deepest free option currently available, 43 automated signals from a single live fetch, plus a separate 11 signal manual methodology built specifically for contractors and home service businesses, citing public research including Princeton's GEO paper presented at KDD 2024. For anyone wanting the most granular free technical read on a single page, this is currently the most thorough option that requires no signup.
Where the category is heading
A consistent finding across independent sources covering this space: citation rates vary as much as 46x across different AI platforms for the same query, and a single generic methodology tends to hide more than it reveals. The tools converge on checking the same basic technical access signals, but the more useful ones are starting to differentiate on what happens after the scan, whether the report turns into a fixable action list or just a number.
Why ours is the one to actually run
Our own scan checks 8 signals, robots.txt access, an llms.txt file, schema markup, rendered content depth, meta structure, content quality, heading structure, and FAQ detection, free, in about 10 seconds, no signup. The real difference between ours and everything else on this list is what happens after the scan. Every other tool here hands you a score and leaves you to fix it yourself. Ours is built directly into a managed AEO service, so the same team that ran the scan is the one that goes in and fixes what it found. That is the gap that actually matters: a number on a screen versus a site that gets fixed.