Metal Apple used the mobile multiplayer online battle arena game Vainglory (Halcyon Fold map pictured) to demonstrate Metal's graphics capabilities at the iPhone 6's September 2014 announcement event.[1] Developer(s) Apple Inc. Initial release June 2014 (2014-06) Written in C++14 Operating system iOS, macOS, tvOS Type 3D graphics and compute API Website developer.apple.com/metal/