This article is about the photo app EPIK. EPIK is an AI application that generates nostalgic photos and recently ranked first on the App Store. The article mentions that EPIK uses uploaded selfies to create vintage yearbook photos. It showcases the trend of large models transitioning from the model end to the application end. EPIK's success also demonstrates the power of the App Store's recommendation algorithm. Data shows that it has brought nearly $7 million in spending for iOS users. However, the popularity of such apps often fades quickly, and EPIK's high ranking may ultimately become a short-lived phenomenon.