Pokémon GO is described as 'Travel between the real world and the virtual world of Pokémon with Pokémon GO for iPhone and Android devices. With Pokémon GO, you’ll discover Pokémon in a whole new world—your own!' and is a popular location-based game in the games category. There are more than 10 games similar to Pokémon GO for a variety of platforms, including Android, iPhone, iPad, Android Tablet and Web-based apps. The best Pokémon GO alternative is Ingress, which is free. Other Pokémon GO like games are Pikmin Bloom, Draconius GO, Peridot and Mobbles.
Maybe not super similar, but fun and geo based. A bit more complicated.