Astronomy has been experiencing an explosive increase in the data volumes, doubling every two years or so. At the forefront of this revolution, the Zwicky Transient Facility (ZTF) – a robotic sky survey – registers millions of transient events (supernova explosions, asteroids, variable stars changing their brightness etc.) in the dynamic sky every (clear) night. Here we present astrophysical Alert-Classifying AI (ACAI), an open-source DL framework for the phenomenological classification of ZTF events.