Do you need a custom UIUX design for your digital product development phase? It would be great if you have a working demo before you do jump into the long and challenging software development stage, at least you have a working design prototype to share with your client or top managerial for approval. It would be an early important documentation of how the system would looks like, based on this you can envision better and gather feedback much more easier based on the clickable interactive demo later.