Case Study: OUAI achieves 4X ROAS with Klarna

How a luxury hair care brand boosted ROAS by 4X

OUAI, a luxury hair and beauty brand, saw growing customer demand for flexible payment options as shoppers invested more in self-care. To address this, OUAI partnered with Klarna to offer pay-in-4 interest-free installments and launched a co-branded checkout and social campaign.

Klarna’s solution—amplified through creative social ads and an A/B test run with agency partner MuteSix—highlighted the “Pay in 4” message; Klarna-driven ads produced 30% more clicks, 28% more add-to-carts, a 5% lift in average order value and delivered 4X ROAS versus non-Klarna creative in under a month, while converting more first-time buyers.

OUAI