The challenge
Northwind had strong traffic and a loyal customer base, but most orders contained a single item. Their existing upsell popup converted under 1% and customers described it as “pushy” in post-purchase surveys.
The team wanted to raise basket size without discounting the whole catalogue or adding friction to checkout.
The solution
We rebuilt the cart experience around GrowCart. Instead of a popup, complementary products now appear inside the cart drawer, and bundles are priced in tiers so customers can see the saving as they add items.
- Outfit bundles built from best-selling pairings in order history.
- Tiered discounts at 2, 3 and 4 items, shown as a progress bar.
- Free-shipping nudge calibrated to sit just above the median order.
The results
Within eight weeks, average order value rose 22% and bundle attach rate settled at 18%. Because offers replaced site-wide promotions, gross margin stayed flat while revenue grew.
Key takeaways
- Offers inside the cart outperform interruptive popups.
- Tiered pricing makes the value of adding one more item obvious.
- Test thresholds against real order data, not round numbers.
We tried three upsell apps before GrowCart. It was the first one where the offers felt like part of our brand and the numbers moved within a week.
