How to Add Upsell Offers to the Squarespace Cart Page
The cart page is one of the best places on your Squarespace store to add upsell offers. The customer has already committed to buying something — they're reviewing their order before payment. Their resistance is lower than anywhere else in the buying journey. A relevant offer at this moment converts well.
Here's exactly how to add upsell offers to your Squarespace cart page.
Why the Cart Page Works for Upsells
Three things are happening on the cart page that make it ideal for upsell offers:
Purchase intent is committed. The customer has added something to their cart. They've crossed the mental threshold from "I might buy this" to "I'm buying this." Adding one more item feels like extending a decision they've already made — not a new decision from scratch.
They can see their total. On the cart page, the customer can see exactly how much they're spending. A bundle offer that shows a clear saving makes the math easy and immediate: "I was going to spend $85, I can get more and spend $100."
One page before payment. After the cart page comes the checkout. This is the last opportunity you have before the transaction closes. Use it.
Five Positions on the Squarespace Cart Page
UpsellGrow supports five offer positions on the Squarespace cart page:
Top of cart: Above all items. High visibility, but can feel intrusive if the offer isn't highly relevant. Best for time-sensitive or high-value offers.
Left of cart: Alongside the items list. Seen while the customer is reviewing what they've added. Natural reading position.
Right of cart: Beside the order summary. This is consistently the highest-converting position for most stores — the customer's eye is already drawn here to check the total and the checkout button.
Bottom of cart: Below all items. Less intrusive — doesn't interrupt the cart review. Works well for FBT suggestions.
Popup on checkout: Fires when the customer clicks Checkout. A deliberate "before you go" moment that creates focused attention on the offer.
Which Offer Type Works Best on the Cart Page
Bundles perform particularly well here. The customer can see their current cart total and evaluate whether adding more at a discount changes their spend decision. The "buy more, save more" proposition is most compelling when they're already thinking about their total order value.
Cross-sells work well if tightly relevant to what's already in the cart. A generic suggestion on the cart page feels like noise — but a highly relevant complement to the specific product in the cart can convert well.
FBT offers carry social proof on the cart page: "Others who bought what you just added also bought this." The implication is that their purchase decision is already validated.
Cart Trigger Behaviour
When multiple products are in the cart, UpsellGrow lets you configure which one triggers the offer: the last product added, the highest-value product, or the highest-priority qualifying offer. This setting is per offer and prevents irrelevant suggestions from firing when the cart has multiple mixed products.
Setting Up Cart Page Offers
In UpsellGrow, create a new offer, select "Cart Page" as the location, configure the offer type and products, choose your position (start with "Right of cart"), add any conditions, and publish. The offer goes live immediately on your cart page.
Start with one offer. Measure for two weeks. Right of cart with a bundle offer is a strong default starting point for most stores.
Ready to Start Earning More From Every Order?
UpsellGrow adds upsells, cross-sells, bundles, and frequently bought together offers to your Squarespace store — across 5 pages and 19 positions. No coding. Setup takes minutes.