A proof of concept tests whether something is technically possible, a prototype tests how it should look and feel, and an MVP is a real, shippable product that tests whether people want it. They answer different questions at different stages: PoC for feasibility, prototype for design, MVP for demand. Building the wrong one wastes time — a polished prototype proves nothing about demand, and a full MVP to test a risky algorithm is overkill.
What's a proof of concept for?
Answering "can this even work?" A PoC is a throwaway technical test of the riskiest unknown — a tricky integration, an algorithm, a performance question. It isn't pretty and isn't for users; it exists to de-risk one feasibility question before you invest in building. If the hard part is technical and uncertain, a PoC is the cheapest way to find out before committing real budget. Then you throw it away and build properly. The mistake is letting a PoC become the product: because it was built fast to answer one question, it skips the structure a real build needs, so "just shipping the PoC" usually means shipping something fragile. Prove the hard part, then start the real version on a clean foundation.
What's a prototype for?
Answering "how should this look and work?" A prototype simulates the experience — clickable screens, a design mockup — so you can test flow and usability before writing real code. It looks real but isn't functional underneath. Prototypes are great for getting feedback on design and the user flow cheaply. The trap is mistaking a polished prototype for validation: it tests usability, not whether anyone will pay. That's a different question entirely. Prototypes range from rough (paper sketches, wireframes) to high-fidelity (clickable designs that look shippable); match the fidelity to the question — a rough one tests whether the flow makes sense, a polished one whether the experience feels right. Don't build a pixel-perfect prototype to answer a question a sketch would settle in an afternoon.
What makes an MVP different?
An MVP is real and shippable — the smallest actual product that delivers the core value and tests real demand with real users. Unlike a PoC or prototype, people use it for real and can pay for it. It's how you learn whether the thing is wanted, not only whether it's possible or usable. That's the version I build: one core loop, live, measured. Coloring Forge (case study) started exactly that way. The word "minimum" trips people up: an MVP isn't a low-quality product, it's a small one. The slice you ship has to actually work and feel trustworthy — "minimum" applies to scope, not to quality, because a broken first impression fails the demand test for the wrong reason.
Which one do you actually need?
Most founders need fewer of these than they think — usually just the MVP. Reach for a PoC only when there's a genuine technical unknown you can't assume away (a hard algorithm, a risky integration, a performance question). Reach for a prototype when the design or flow is the real uncertainty and you want feedback before building. But when the open question is "will anyone want and pay for this?" — which it usually is — the answer is a tight MVP, because that's the only one of the three that puts a real, usable product in front of real users. Pick by your single biggest unknown, and skip the steps that answer questions you don't actually have.
How do they fit together in sequence?
Sometimes you use more than one, in order, each de-risking the next. A genuinely hard, novel product might go PoC (prove it's possible), then prototype (design the experience), then MVP (test demand) — but that full sequence is rare and mostly for technically risky builds. Far more often, one stage is enough: you already know it's buildable and roughly how it should work, so you go straight to the MVP. The skill isn't running all three; it's honestly naming which questions are still open and only doing the steps that answer them. Each stage you can confidently skip is time and money straight back in your pocket.
How do I choose with a founder?
I match the tool to the biggest risk. Technical feasibility in doubt: a quick PoC. Design or flow in doubt: a prototype. Demand in doubt (the usual case): go straight to a tight MVP, the model behind my SaaS delivery. Most founders don't need all three — they need the one that answers their riskiest question fastest, then they build from what it tells them.
Related SaaS guides
See MVP mistakes that kill launches, how long it takes to build an MVP, and how to validate an idea before you build.
Not sure which one you need? Tell me what you're building — I'll tell you whether it's a PoC, a prototype, or an MVP.
