Zwift is described as 'Massively multiplayer online cycling and running physical training program that enables users to interact, train, and compete in a virtual world' and is a Fitness Tracker in the sport & health category. There are more than 10 alternatives to Zwift for a variety of platforms, including iPhone, Android, Web-based, iPad and Android Tablet apps. The best Zwift alternative is VeloWorkout, which is free. Other great apps like Zwift are Pronghorn Fitness, RunTogether, Intelligent Cycling and TrainerRoad.