I built a tool to diagnose what AI engines say about brands. Here is what 11,371 checks revealed.

I kept seeing back in 2025 the same thing in conversations with founders and agency owners. They were optimising for Google rankings while their buyers were asking ChatGPT about them.

So I built SiteSignal to diagnose AI visibility and hallucination.

We have run 11,371 hallucination fact-checks across real brand websites on ChatGPT and Perplexity. 15.6% of the time, the AI got basic facts wrong. Wrong pricing, wrong founder, wrong company name. One brand had Perplexity list them under a completely different business name. They had no idea.

The visibility gap is even bigger. Brands ranking top 5 on Google are appearing in AI answers 3% of the time. Their competitors sit at 71%.

We are in early revenue. The product is live at sitesignal.app. Free 7-day trial, no card needed.

Happy to share more of the data if useful. And genuinely open to feedback on positioning. AEO (Answer Engine Optimisation) is a new category and I am still figuring out how to explain it clearly to different audiences. We mainly work with SMB via private paid beta and agencies.

What is your experience with AI search visibility diagnosis? Are your clients or users asking about it yet?