SimilarWeb, SEMrush, and tools like them estimate traffic volume. They tell you how many people arrive at a site. They do not tell you what happens once those people try to buy.
RiskSignal measures what's broken on the conversion path, the specific technical friction your prospects have not caught yet. That's what makes the outbound specific enough to convert.
Everything RiskSignal scans is publicly observable. No credentials, no backend access, no notification to the prospect. The friction is already sitting on their site in plain view.
The reason it works is that the prospect has not caught it yet. When your outbound points to a real problem on their own conversion path, it does not read like the last three emails they deleted. It reads like someone who actually looked.
That is the difference between estimating traffic and measuring friction. One sizes the audience. The other gives you the specific, observable reason to reach out, which is what makes the outbound specific enough to convert.