The nightly decision, in your pocket.

A completely free iPhone app

Available on the App Store.

Aurora Tromsø Northern Lights scores 41 named viewing spots from 0 to 100, using MET Norway cloud forecasts and NOAA’s Kp index. It helps you compare where and when conditions look useful.

The app is completely free. This guide gives the places and decisions more context. The app brings the forecast comparison onto your iPhone.

View Aurora Tromsø on the App Store

What it does

• Compares 41 named spots, including the three in our public preview.
• Shows a planning score and the best forecast window for each location.
• Uses cloud forecasts, global activity inputs and local catalog factors to rank options.

What it cannot tell you

The score is not a sighting probability. It cannot confirm that an aurora is overhead, that a road is open, or that parking and winter paths are usable. Read the method and limitations before treating a number as a trip decision.

Before heading out, use the guide’s evening checklist.