When to use it
Newsletter signups, spin to win, exit offers, size charts that open on click - room for a form or a table without blocking what the shopper was reading.
When to skip it
When the message fits in one line. A bar is lighter.
On phones
It becomes a sheet that slides up from the bottom of the screen.
Read more
In the app: Help → Popup types: popup, bar, slide, widget, and inline block.