The iFruit app served as a bridge between your smartphone and your GTA V or GTA Online experience. It featured a variety of "mini-apps" that allowed you to manage your criminal empire while away from your console.
Over time, the iFruit app became increasingly difficult to maintain. Users frequently reported long loading times and connectivity issues as mobile operating systems evolved while the app's code aged. Rockstar eventually decided to sunset the application to move toward more modern, web-based solutions. Grand Theft Auto V iFruit App Tutorial
Long before the "can you pet the dog" meme, iFruit gave us a Tamagotchi-style minigame for Franklin’s Rottweiler, Chop. By feeding, watering, and playing with him in the app, you could improve his happiness and unlock new tricks (like sitting or begging) in the main game.