This app uses Firebase Cloud Messaging to notify you when it may be possible to see the northern lights (aurora borealis / australis).
It provides configurable notifications for local aurora probability, Kp-index (Hp30), solar wind parameters (Bz/Bt) and Kp-level forecast for the evening.
It also allows you to be alerted when other app users nearby have seen the aurora light display. For the alert feature to work, the app allows uploading aurora reports when you are successful hunting and get to see the aurora light display yourself.
The premium version which can be bought within the app itself offers some more technical information and graphs of Kp-index predictions, cloud cover and solar wind parameters - and some hidden features.