You can use it while playing the game to keep track of your progress, mark interesting locations on the map, and make notes.
You can change the language of all locations on the map to any of the languages supported by the game, including Spanish, German, Japanese, and Chinese.
You find markers for Shrines, Towers, Villages, Stores, Korok Seeds, Lightroots, and many more interesting locations.
You can easily add notes to any location and pins on the map, and you can also make Quick Notes while you are playing the game.
This is a native app that's fully integrated in iOS: your data is synced with iCloud, offers a dark mode, and the app even has support for advanced system features such as the Shortcuts app.