'Complete the set' cross-sells: +€8.4K revenue during the test
Test run byDRIP AgencyCRO agency
Commentary byLiftArchiveOur analysis, not theirsFraming cross-sell recommendations around completing a set lifted revenue during the test from €167K to €176K (+€8.4K) for SNOCKS.
DRIP Agency ran this A/B test on product pages and in the cart and published it in its SNOCKS case study.
Several cross-sell approaches were tested, and this is the strongest reported result.
- Revenue during the test: €167K to €176K, reported as a gain of about €8.4K (roughly 5%).
- Several variants were tested. The source reports the strongest, so the typical effect may be smaller.
- Order value and attach rate were not shared for this test.
The change
The variant cross-sell suggests items that complete a set.
Simplified mockup drawn by LiftArchive from the shared screenshots.
Control
Product pages and the cart showed the existing cross-sell recommendations.
Variant
Recommendations were chosen and framed to help shoppers complete a set, rather than suggesting unrelated add-ons. DRIP also tuned how relevant the suggestions were and when they appeared.
Why it likely won
Our reading of the result, not the practitioner's claim.
- A set feels finished. Suggesting the missing piece taps into a wish for completeness rather than a push to spend more.
- Relevant suggestions are easier to accept than random products, so more shoppers add them.
- Basics like socks and underwear are natural multi-item purchases, which suits set-based offers.
Caveats: Several cross-sell variants were tested on product pages and in the cart, and the source reports the strongest one. Revenue is the total during the test runtime, not an annual figure. DRIP Agency did not publish sample size, test length or statistical significance.
Who ran it
DRIP Agency ran this test for SNOCKS and published the results (DRIP Agency case study). The numbers are theirs; the summary and commentary on this page are ours.
Read the original case study on DRIP Agency →
How to run this test on your store
- Hypothesis
- If we show cross-sells that complete the shopper's set instead of generic add-ons, then revenue per visitor will rise because the suggestion feels relevant and finishes the purchase.
- Primary metric
- Revenue per visitor
- Guardrails
- Cart-to-checkout rate
- Average order value
- Conversion rate
- Who should test it
- Stores whose products naturally go together, such as apparel sets, matching home goods or kits. It is less likely to help single-purpose products with no clear companion item.
Questions
What is a 'complete the set' cross-sell?
It recommends the item that finishes what the shopper is already buying, like the matching piece of an outfit.
It differs from showing best-sellers or random add-ons.
Should cross-sells go in the cart or on the product page?
SNOCKS tested approaches in both places. The source does not split the result by placement, so test each one on your store.
Can cross-sells hurt conversion?
They can if they distract from checkout. Watch the cart-to-checkout rate alongside revenue.
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