It sounds like it lets you build native apps with updatable HTML/JavaScript extensions.
So in the spectrum of native <-> web-app, this is closer to native, like Titanium (but more so?) and PhoneGap (now Apache Cordova) is closer to the web-app side.
It differs from the others in that it provides the dynamic update capability and is intended to be embedded as a part of a native application, rather than being the full application.
So in the spectrum of native <-> web-app, this is closer to native, like Titanium (but more so?) and PhoneGap (now Apache Cordova) is closer to the web-app side.
It differs from the others in that it provides the dynamic update capability and is intended to be embedded as a part of a native application, rather than being the full application.