The fold
Say enough, fast enough, that someone stays. The references were AI SaaS and consumer products, which sell an unfamiliar thing by showing it working.
So the fold is the product: an embedded build of the real interface, running a flow on its own, most of it live to the touch.
How it was built
The platform's own frontend, cloned and hosted, with flows scripted in rather than driven by a backend.
A flow is handed in rather than baked in. Swap the script and it runs the new one.