Most aurora apps give you a Kp number and a map. Chasing Pink is a photographer's 7-year northern-lights book turned living instrument. Every spot in the archive carries its own Kp threshold, so the live NOAA forecast gives a real go/no-go for that exact place. Forecast, auroral oval, 21-point Atlas, Night Planner, darkness & moon calendar, exposure tools, offline field mode — plus a kids' aurora game. Bilingual, free, no signup. Not an aurora app. An aurora companion.