Game Companion: Horizon Zero Dawn is an unofficial app that serves as a companion to the popular game Horizon Zero Dawn. It is developed by Uyt Development and is available for free on Android. The app provides a map featuring all important locations of the game, which can be filtered based on their type. The detailed description of every location helps players to understand the game better.

One of the most useful features of the app is the ability to mark locations as completed to keep track of the user's progress. It also includes a light and dark theme to suit the user's preferences. The app works offline, so an internet connection is not required. Additionally, it includes the DLC map: The Frozen Wilds, and users can search for locations by their name or description.