İDO — Istanbul Sea Buses & Ferries App

İDO (İstanbul Deniz Otobüsleri) operates Istanbul's high-speed sea buses connecting the city to Bursa, Yalova, and the Princes' Islands across the Sea of Marmara.

The app handles bookings, route schedules, vehicle ferry transport (you can put your car on a sea bus for the Bursa crossing — saves 1.5 hours vs the road), and passenger-only fares. Indispensable for weekend trips to Princes' Islands or Bursa.