Combine the VPC with the Strategy Canvas tool to visualize if and how your value proposition differentiates from the competition (meaningfully). 

The Strategy Canvas is a tool from the Blue Ocean Strategy book specifically focused on differentiation.

Strategy Canvas is a central diagnostic tool and an action framework for building a compelling blue ocean strategy. In one simple picture, it graphically captures the current strategic landscape and the prospects for an organization. Chan Kim and Renée Mauborgne developed the strategy canvas.