Companion apps are mobile apps that follow along the adventure game. The player can sync, manually or automatically, their app to the game they are playing. The app then will only show content that is relevant in the current state of the game.
This reduces spoilers and can make playing the game a better experience.
The companion app framework is upkept by Nice Game Hints. It is our job to upkeep the servers and the mobile app. We will also build the apps for you. As the app building is so productized, building these kinds of mobile apps is fast and cheap.
An example of so called manual synced companion app is our first ever: Portal Companion App.