Which Framework does appsheet use?

Well, I’m really curious about how does appsheet can store information in the device and then upload it once you regain connection, and many other amazing features.
I’ve the doubt about wich framework does appsheet use.
Is it a web-view based application or completely native application, or what?

Actually, it’s a hybrid web-app. There is a native container within which the web-app runs. This how the apps get access to some of the device features.