When a company adopts Stripe, Intercom, HubSpot, or Calendly, nothing announces it. No press release, no changelog entry a stranger can subscribe to. The only public trace is a script tag on a page - assuming that tag shows up in a way anyone's actually watching for.
Testing this against real company sites (close.com, gumroad.com, buffer.com, clearbit.com, loom.com, zapier.com) surfaced a real gap: a plain HTTP fetch - the cheap, standard way to check a page - found a detectable tool on only 1 of 6 sites. The rest load their tags through Google Tag Manager, which injects scripts client-side after the page has already loaded. A static fetch never sees them; only an actual browser rendering the page does.
Buying Signal Watcher switched to real browser rendering (Playwright) to close that gap. Re-tested against the same 6 sites afterward: 4 of 6 detected correctly. It watches a list of domains on a schedule and reports only a tool that's new since the last check - not a full inventory replayed every run.
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