How to Suggest Complementary Products on Squarespace (Step by Step)
Complementary products are products that go together — not as direct alternatives to each other, but as natural companions that enhance each other's usefulness or appeal. A camera and a lens. A candle and a holder. A coffee grinder and a bag of specialty beans.
Suggesting these combinations on your Squarespace store is one of the highest-value things you can do for your revenue. Here's how to do it step by step.
What Makes Two Products Complementary?
Three things signal complementary products:
Functional pairing: One product makes the other more useful. A phone case and a screen protector. A dress and a matching belt. Products that work better together than separately.
Completion: One product completes a set that the other starts. If a customer buys the first volume of something, the rest of the series are complementary. If they buy the base product, the accessory range completes it.
Behavioral data: Your order history tells you which products customers actually buy together, regardless of whether the pairing makes intuitive sense. Some of your best complementary pairs are hiding in your transaction data.
Step 1: Identify Your Complementary Pairs
Start by reviewing your last 3 to 6 months of orders. Which products appear in the same order frequently? Export your orders from Squarespace and look for recurring two-product or three-product combinations. These are your highest-probability starting points.
Alternatively, if you're using UpsellGrow, the Frequently Bought Together feature does this analysis automatically — it processes your Squarespace order history and surfaces the most common co-purchases.
Step 2: Prioritize by Potential Impact
Not all pairs are equal. Prioritize pairs where:
- The trigger product is a high-traffic product (more impressions for your offer)
- The suggested product has a meaningful price (larger AOV impact)
- The complementary relationship is obvious (higher trust and conversion)
Step 3: Choose the Right Offer Type
For complementary products, you have two options in UpsellGrow:
Cross-sell: Suggest the complementary product as a standalone recommendation. The customer adds it separately. Best when the products are distinct enough that bundling feels forced.
Bundle: Package the complementary products together at a discount. Best when the pairing is very natural and you want to make it as easy as possible for the customer to get both at once.
Step 4: Choose the Right Position
For complementary products on the product page, "Below Add to Cart" is typically the strongest position. The customer has finished reading the product description and is about to commit — this is the moment to show them what goes with it.
For the cart page, "Right of cart" sits naturally next to the order summary and performs well for last-chance complementary suggestions.
Step 5: Write a Clear Offer Heading
The heading of your offer widget sets the context. "Customers also bought" is data-driven and carries social proof. "Complete the look" works for fashion. "Goes well with" is direct and honest. Choose a heading that matches both your store's voice and the nature of the complementary relationship.
Step 6: Measure and Iterate
After two weeks, check UpsellGrow's analytics. Is the conversion rate above 10 percent? If not: is the product pairing genuinely complementary? Is the position right? Is the suggested product priced appropriately? Adjust one variable at a time and re-measure.
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.