GRAIN그레인 is a free social networking app designed for iPhone users, developed by jeonghoon ji. The app falls under the Social & Communication category, specifically focusing on social networking.

In the "피드 탭," users can explore various curated film stories by the Grain editor, view popular film photos shared by other users, and engage with real-time film photos posted by the community. Users can also customize their feed to only see content from subscribed accounts and share details about the film used, shooting environment, and lens in their feed posts.

The "커뮤니티 탭" allows users to find like-minded individuals interested in photography, participate in photographer and model matching, engage in buying and selling of film cameras, films, and lenses, discover photography classes, and learn valuable tips from experienced film photographers.