What's the best iOS app for navigating public transit in a new city?

Citymapper is an exceptional choice for navigating unfamiliar public transit systems. The app excels by integrating real-time departure information, service disruption alerts, and multiple transport modes into a single, coherent trip plan. For a traveler landing in a supported city, the app can provide the fastest route from the airport to a hotel, factoring in walking times to station entrances and even suggesting the best subway car to board for an easier exit. It handles complex, multi-leg journeys across metros, buses, trams, and ride-share services seamlessly. User reviews consistently highlight its superior accuracy for subway and bus times compared to more general mapping apps. A key feature is the inclusion of 'Get Off' alerts, which notify users when their stop is approaching—particularly useful on unfamiliar bus routes or in systems without in-car announcements. The app also offers offline maps for subway systems, a crucial failsafe when cellular service is unreliable. However, its primary limitation is geographic coverage; it operates deeply in major global cities but may not include smaller towns or regions. For the cities it does support, few apps provide such a comprehensive, anxiety-reducing toolkit for mastering public transport.