AppleOnTop is a new shisha bowl that came into production in 2013. AppleOnTop has some similarities to a vortex and other bowls. It has spiked with 4 holes at the middle of the bowl. So, it is made of aluminum and it comes with a screed for the coal so it is not used with aluminum foil.
Vortex bowls have a spike at the middle of the bowl. Compare to other types of shisha bowls, Vortex Bowls do not have holes at the bottom and hold the tobacco juices for a longer time. Vortex bowls are made from clay, pyrex, silicon, aluminum, etc.