Which competitor of Transit is the most used transit app in the world?
Transit (app):  Transit is in direct competition with other transit services such as Moovit and CityMapper, as well as general mapping services such as Google Maps and Apple Maps. Moovit:  Moovit is the most used transit app in the world with over 80 million users worldwide, supporting +1,500 cities, in 78 countries, and 43 languages.
Moovit