Kolumbus Reise is the official travel planner for people travelling by public transport in Rogaland County, Norway.
You get bus departures in real-time and information about service disruptions, as well as departure times for boat and train. The app includes a travel planner which allows you to find the easiest route to your destination. The itinerary can be planned from your nearest stop, a specific address or by map. Most journeys include pricing information.

Also try "Kolumbus Sanntid" for realtime information and "Kolumbus Billett" for tickets.