Pokémon Go (stylized as Pokémon GO) is a freemium location-based mobile game developed by Niantic for iOS and Android devices, containing some but not all aspects of an augmented reality game. It was released in most regions of the world in July 2016. Making use of GPS and the camera of compatible devices, the game allows players to capture, battle, and train virtual creatures, called Pokémon, who appear on device screens as though in the real world. The game is free-to-play, although it supports in-app purchases of additional gameplay items. An optional companion Bluetooth wearable device, the Pokémon Go Plus, is planned for future release and will alert users when Pokémon are nearby.