Libra Eorzea offers two big features that tie into the game proper: a game database and a character profile viewer. The database can be stored on a player's mobile device to allow access to information regarding items, quests, achievements, and NPCs offline. However, the profile viewer requires an online connection and an account, and can view both the player's and others' character gear and stats.
The app also accesses players' friend lists, free companies, and linkshells. Square Enix says that it will be expanding Libra Eorzea to include more features in the future.