A flash-sale email that's just a banner image and a link to your homepage asks the recipient to go find the sale themselves, after the moment of urgency has already passed. MailInApp's Countdown stays accurate no matter when someone opens the email, a real Buy Now button checks out immediately, and a Carousel shows every item on sale — the whole flash sale lives in the email, not just an announcement of one.
Urgency only works if it's honest. A countdown baked into an image at send time is already wrong by the time half your list opens the email — and a link to "shop the sale" adds a whole extra step right when speed is the entire point.
A countdown that's never a stale number
The Countdown block redraws the real time remaining fresh on every single open, computed from the actual end time you set — it works in every inbox, including Outlook, since it's a from-scratch animated encoder rather than a fixed image. Whether someone opens the email one minute or three hours into the sale, the number they see is honest.
Checking out without leaving the email
The Product block's Buy now button link-first opens a real Stripe Checkout Session on your own connected Stripe account and redirects there for payment — MailInApp never holds funds or sees card details. Set the flash-sale price once and it's accurate for every recipient, at any moment in the sale window.
Every discounted item in one place
A Carousel shows every item included in the sale as a swipeable gallery, so recipients can see what's actually discounted without a separate landing page. Add one Product block per item if the flash sale spans more than a single product, each with its own price and inventory.
Selling out mid-campaign, safely
Inventory on each Product block is checked again the instant payment clears, not just when the email is built. If two people buy the last item at the same moment, only one purchase goes through — the other is refunded automatically with an explanation, so a fast-moving flash sale never oversells.
Getting started
Add a Countdown block with the exact sale end time, a Carousel with every item on sale, and a Product block per item recipients can buy directly. Send once the sale window actually opens — the countdown stays accurate for whoever opens the email at whatever point in that window they get to it.