Case Study: GOMAJI achieves 3.5x increase in mobile in-app purchases with Facebook dynamic ads

Making marketing more efficient

GOMAJI, Taiwan’s largest group‑buying platform for food, beverage and entertainment coupons, launched a mobile app to grow brand recognition, downloads and in‑app sales to capture a larger share of the market. With thousands of products and millions of potential users, the team faced the challenge of creating and managing large numbers of targeted ads while keeping marketing efficient.

GOMAJI followed Facebook’s recommendation to run two dynamic ad campaigns—one to drive app installs and another to retarget app users for purchases—letting Facebook automatically select high‑performing product images from its catalog and optimize for conversions. In two months the campaigns cut cost per install by 28%, cost per transaction by 50%, and increased in‑app purchases 3.5x, enabling the company to scale spend 12.5× while freeing up resources for other priorities.

GOMAJI

Rio Chen

Vice President of Marketing