Worked well in Levi, Finland
During our stay in Levi, we had several cloudy days with no lights. On our last night, the clouds were forecasted to break up late in the evening. To increase our chances to see them, we went on a small tour plus got this app. We were very lucky and saw an amazing display! The app was sending alerts as we were starting to see the lights on several occasions, not afterwards. It also sent an alert at 4:15am that night. We bundled up, went outside and saw another display that lasted 30minutes! We were the only ones out seeing it and would have missed it without this app.