EPIK is an AI-powered photo editing app that has quickly topped the App Store charts in 56 countries with its nostalgic 90s-style school "yearbook" photo templates. Users can upload selfies to generate vintage yearbook photos in various poses and styles. The app offers a paid model, allowing users to choose from different delivery speed generation packages. The nostalgic AI yearbook photos have gone viral on social media, particularly sparking a trend on TikTok. EPIK's success is partly attributed to collaborations with KOLs and proactive social media marketing.