Userium

Userium is a business whose own site puts it this way: "Website usability audit tool for AI. The 2013 checklist, resurrected for 2026. Copyable prompts to audit any website against proven UX principles." To AI engines like ChatGPT and Perplexity it is partially visible, scoring 6.6 out of 10, readable in places and missing in others.

On the page itself the strengths are clear: a clear heading structure and crawler access and the files AI engines look for. It is passable on partial sitemap and link coverage. What holds it back is structured data describing the business, a clearly stated business identity and credibility markers like credentials or reviews.

Away from its own site, other sites link to it and people discuss it in places AI engines read. There is some, but not much, sign that the domain is only lightly established. Beyond that, AI engines do not yet recognise it as a distinct business, there is no press coverage to draw on and it does not come up on Reddit. Those are earned elsewhere on the web, not fixed on the site itself.