Horizon Companion is a free iPhone app developed by Sebastian Kruse. It falls under the category of Utilities & Tools and serves as an offline map for the popular game Horizon Zero Dawn.

The app provides a comprehensive map with the positions of various in-game elements, including Vantages, Ancient Vessels, Metal Flowers, Banuk Figures, Texts, Scanned Glyphs, Important Locations, Campfires, Machine Sites, and Merchants. This makes it a valuable tool for players who want to explore the game's vast open world and make sure they don't miss any collectibles or key locations.

One of the standout features of Horizon Companion is the checklist functionality. Users can track their progress by checking off the positions they have already discovered, ensuring they can easily keep track of what they have found and what still needs to be discovered.

With its offline capabilities, Horizon Companion allows players to access the map and checklist even when they don't have an internet connection, making it a convenient companion for on-the-go gaming sessions.