What it is

The loudest format the app has: the whole screen, shown once the visitor has scrolled far enough to be interested.

When to use it

• A short, big sale where reach matters more than subtlety.
• Landing pages from ads, where the offer IS the page.
• Rarely - a full-screen takeover on every visit trains people to close.

Why it works

Scroll depth is a soft intent signal: the pop-up reaches people who engaged, not people who bounced in the first second.