What is the difference between a proof of concept and a prototype?

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A proof of concept and a prototype are often used interchangeably but they serve different purposes in product development. A proof of concept (POC) answers one question: is this idea technically feasible? It's the earliest possible test of whether the core concept works, built to validate an assumption, not to demonstrate a product. A POC is often internal, rough, and not intended to be shown to end users. A prototype goes further. It demonstrates how the product will work in practice: the user experience, the interface, the core functionality. A prototype is built to be shown: to users, to stakeholders, to investors. It's real enough to generate genuine reactions and inform decisions about what gets built next. Skipping either stage is expensive. 49% of software projects face budget overruns, and poor requirements gathering (exactly what a POC and prototype are designed to address) is cited as the leading cause of failure in 39% of cases. Historically, running both a POC and a prototype phase added significant time and cost to any project. Most smaller teams couldn't afford to do both properly. Today the two phases are typically combined into a single fast build, something that proves the concept and demonstrates the experience at the same time. At Bluprint that's what a prototype sprint produces, in as little as five days, before any significant development budget is committed. Read our full guide to proof of concept in software development → Talk to us about your idea →