Glossary
Limited-Time Offer
A discount or deal explicitly framed as expiring soon, meant to turn "maybe later" into "yes, now."
A limited-time offer works on loss aversion: people weigh the discomfort of losing a deal more heavily than the pleasure of gaining one of equal size, so a countdown or expiry date can move a visitor to act who would otherwise have closed the tab and forgotten.
The deadline has to be real, or close to it. A "24-hour offer" that reappears identically every time a visitor returns trains people to ignore your urgency entirely, and eventually your brand along with it.
It pairs naturally with a countdown timer inside the popup itself, watching the minutes tick down is a stronger cue than a sentence saying the offer expires soon.
See it in practice