MVP or prototype app?
A MVP is a prototype at its heart but further along in the product development process. It is essentially the first, most basic version of your app, which can be shown to users. Building an MVP is all about gathering user feedback early and then producing further iterations that reflect user needs and have real business value.
You can find out more about prototype apps here, and view our handy comparison table featuring the differences between prototype apps, MVPs, InVision and Marvel mockups.