Best Cart Page Plugins for Squarespace to Increase Conversions
If you're looking for cart page plugins for your Squarespace store, the options are limited but the ones that exist are effective. The cart page is a high-intent moment — customers who have added products and are reviewing before checkout are the most ready-to-buy audience on your site.
Here are the best cart page plugins for Squarespace to increase conversions in 2025.
What Cart Page Plugins Can Do on Squarespace
Squarespace's default cart page is clean and functional but lacks two things that significantly affect conversion and revenue:
Upsell and cross-sell offers: The ability to show relevant product suggestions on the cart page — where customers are already in buying mode and about to commit to payment.
A slide-out cart drawer: Keeping customers on the current page when they add something, rather than navigating them away to the cart page.
The best Squarespace cart plugins address both.
1. UpsellGrow — Best Cart Plugin for Increasing Revenue
UpsellGrow is the most complete cart plugin for Squarespace. It adds both a slide-out cart drawer and upsell offer support across the cart experience.
Cart page offers: Five positions — top, left, right, bottom of cart, and popup on checkout click. Right of cart, beside the order summary, is consistently the highest-converting position.
Slide-out cart offers: Three positions inside the drawer — above checkout button, below cart items, and popup on checkout click.
Offer types: Cross-sell, bundle, and FBT all work in cart positions.
Cart trigger behaviour: Configure which product in a multi-item cart triggers the offer — last added, highest value, or highest-priority qualifying offer.
Analytics: Per-offer conversion rates and revenue tracking for every cart position.
Pricing: Free (1 offer), $17/month Growth, $29/month Scale.
Best for: Stores that want to increase average order value by catching customers at the highest-intent moment before checkout.
2. Native Squarespace Cart Features
Squarespace's built-in cart includes basic functionality — quantity adjustment, item removal, coupon code entry — but no upsell functionality, no slide-out drawer, and no offer positions. Worth mentioning to clarify what you're augmenting rather than replacing.
What to Prioritize
If you're adding a cart plugin to your Squarespace store for the first time, start with:
- The slide-out drawer — the UX improvement that has the broadest impact across all customers
- One bundle offer in the right-of-cart position — the highest-converting combination for most stores
Measure for two to three weeks. Then expand to the slide-out cart offers, the popup on checkout, and additional cart page positions based on what the analytics show.
The Combined Impact
Stores that add a slide-out cart plus cart page upsell offers typically see conversion rate improvements (from the reduced navigation friction) and AOV improvements (from the offer conversions) simultaneously. The two effects compound — more customers completing checkout, and those customers spending more per order.
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.