Unreal Engine 3 (UE3) was Epic's previous-generation technology that powered games on Xbox 360, PlayStation 3 and PC.
From 2D mobile games to console blockbusters, Unreal Engine 4 gives you everything you need to start, ship, grow and stand out from the crowd. It provides a complete suite of game development tools made by game developers, for game developers. Unreal Engine 4 (UE4) is Epic's next-generation technology, released in 2014.