UI Prototyping provides a number of useful functions. Perhaps the most significant is in providing the opportunity to go through the build process as a test run. A lot can be learned about the system during prototyping, including the discovery of unknown variables or intentions and an alignment of expectations between the client and build team.

One other significant benefit of a prototype is that, for a minimal expenditure, one is equipped with a tool that might make the product more interesting or accessible to potential investors.