It can only see what leaves a mark in the browser.
Shopify leaves a mark. Klaviyo leaves a mark. Gorgias leaves a mark. Anything with a script tag or a fingerprint in the markup, we find it, free, in seconds.
Their data warehouse leaves no mark. Their CRM leaves no mark. Their billing system, their internal analytics, the thing their support team actually lives in all day: nothing. No trace, no signature, invisible.
Which is inconvenient, because for a lot of B2B selling, those are exactly the tools that decide whether you have a deal.
So we read a different document.
Their job ads.
A job ad is written by the person who will manage the hire, and that person cannot help themselves. They list the stack. They have to, because they are trying to attract someone who already knows it. "Experience with X required" is a confession dressed as a requirement.
Nobody writes a job ad to tell you what they use. They write it to hire someone, and telling you is unavoidable.
That gives you two sources answering the same question from different sides. The HTML tells you the customer-facing layer. The job ads tell you the layer behind it. When they disagree, that is interesting too: a job ad naming a tool you cannot see in the markup usually means a migration in progress, and a migration in progress is the single best moment to show up.
The same document does a second job, which is why we keep it. What they are hiring for is what they are betting on. Three enterprise sales roles and no engineers is a company harvesting. Six engineers and no sales is a company building. You can read a roadmap off a careers page if you are willing to sit with it for ten minutes.
The limits are real. Job ads go stale, companies leave old ones up, and "experience with X" sometimes means one person used it once at a previous job. Treat a single mention as a rumour and a repeated mention as a fact.
One thing to do next: open your best prospect's careers page and read every technical job ad on it.
You will know more about their stack in fifteen minutes than a detection tool will tell you all year.
Pick one competitor. See what we find.
Your first benchmark is free. One domain, measured against you, no card and no call.