Through those free apps, you can observe the geomagnetic response and radius trend of the aurora, so as to know its predictability. There are 5 levels in total.
Although the predictability of the aurora is based on sunspots and geomagnetic reaction, if the weather is not supportive and thick clouds covered the sky, the northern light would not be visible, no matter how exaggerated and beautiful it bursts all over the earth. That's why it's important to look for the aerial condition on satellite cloud images, analyze the route, and plan properly. You can also utilize the aurora forecast website provided by the University of Alaska below.
In addition, you should also pay attention to the position of the moon and the change in the lunar phase, as the brightness of the moon will also affect the brightness of the aurora. Many people always visit on days during the new moon where the aurora is less affected by the moonlight. However, it is actually beneficial sometimes to have moonlight. In this way, parts of the landscape can be clearly captured without exposing for too long, but of course the magnificence of the aurora depends on the brightness level of the performance at that time.