Casper*

A checkout redesign with measurable add-to-cart lift.

*Casper is a direct-to-consumer sleep brand selling mattresses, pillows, and bedding online and across 932+ retail locations in the US. At the time of this project, Casper was in a high-growth Series B phase with 1.5+ million customers and a focus on e-commerce conversion optimization.

SUMMARY

A cross-sell redesign within e-commerce checkout, tested against 466K users. Result: attachment rates lifted up to 20%, projecting $500K+ in annual revenue, without disrupting checkout conversion.

ROLE

Product Designer,
Series B Startup

Casper
OBJECTIVE

A poorly designed cross-sell risks checkout drop-off, so the brief was clear: lift attachment without disrupting conversion.

DIAGNOSIS

The inherited cross-sell carousel was underperforming. Auto-rotation carousel moved faster than buyers could engage, dot navigation was impercievable on mobile, and low visual contrast buried the add-to-cart moment.

Casper problem
DESIGN ITERATIONS

Explored contextual copy per product to give buyers more incentive at the moment of add-to-cart. Tested CTA treatments across button size, label copy, and icon vs. text styles.

THE CONSTRAINT

Minimal engineering lift. Any redesign had to be A/B testable in isolation with no risk to primary checkout conversion.

Casper iteration 1 Casper iteration 2 Casper iteration 3

Cross-sell redesign iterations

THE FINAL DESIGN

Slowed carousel movement, replaced dot navigation with arrows, and added contextual copy to each product. The cross-sell peeks in as users reach end of scroll, and the primary checkout CTA remains at mid-screen.

REASONING

A large full-width CTA touch area and directional arrows reduce friction at the moment purchase intent peaks. A blue card background adds visual contrast while using existing button styles.

Casper design process Casper cross-sell module
OUTCOMES

Attachment rates improved across every product tested, with gains ranging from 7% to 20%. Revenue per user lifted 1%, projecting to $500K+ annually.

VALIDATION

Primary checkout conversion held unchanged. The redesign lifted cross-sell without adding friction. Design is a growth lever.

Results

Statistically significant
conversion lift:

+0%

Pillow attachment

+0%

Mattress Protector attachment

$0K+

Projected AR impact

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