Hey, Joe here from inkle! Sago's reply is really good, but broadly for those two specific languages: Ink is designed to be one component in a larger game engine - the runtime has a simple core loop of choice -> text generation -> choice. How you implement the UI is up to you (right now we have a C# runtime designed for usage in Unity). By comparison, Inform7 is designed for building standalone parser-based text adventures in the vein of Zork and its more modern successors.