Go-Ahead Nordic is a free Android app developed by Go-Ahead Norge AS that lets you purchase train tickets along Norway's beautiful coast, from Stavanger in the west to Oslo in the east. The app allows you to buy tickets for Sørtoget, Jærbanen, and Sørtoget Lokal (formerly Arendalsbanen).

With Go-Ahead Nordic, you can easily purchase both single and period tickets, keep track of your tickets, check train schedules, and find links to relevant travel information and onboard services.

To use the app, you need to create a profile when purchasing your first ticket.

Overall, Go-Ahead Nordic is a convenient and easy-to-use app for purchasing train tickets in Norway.