MVP vs prototype vs proof of concept
The difference between a proof of concept, a prototype and an MVP, what each costs, and which one you need before raising money or launching.
By the v1build engineering team · Published · 5 min read
These three words get used interchangeably, and that confusion costs founders money. Here is the plain difference.
| Proof of concept | Prototype | MVP | |
|---|---|---|---|
| Question it answers | Can this be built? | Will people understand and want it? | Will people use it and pay for it? |
| Who uses it | Your team | Test users, investors | Real customers |
| Real data and accounts | No | Usually fake | Yes |
| Security and permissions | Not needed | Not needed | Required |
| Typical time | Days | Days to two weeks | Three to twelve weeks |
| Typical cost in 2026 | Your time or a few thousand dollars | AI builder subscription to $6,000 | $6,000 to $150,000 depending on who builds it |
Proof of concept
A proof of concept tests one technical risk: can a model read these invoices, can we get data from this API, does the maths work. It is usually ugly and thrown away. You need one when the core idea depends on something nobody is sure is possible.
Prototype
A prototype shows what the product will feel like. It can be a clickable design or an app generated by an AI builder such as Lovable or Bolt. It is perfect for user interviews and investor conversations. It is not built to hold real customer data safely.
MVP
A minimum viable product is the smallest version that real customers can sign up for, rely on and pay for. That means accounts that are secure, data that stays separate between customers, payments that reconcile, and code someone can keep building on.
The 2026 shortcut, and its trap
AI builders have made prototypes almost free. The trap is mistaking a prototype for an MVP and putting real customers on it. The common failures are the same every time: secret keys in the browser, users able to see each other’s records, half-wired payments and no tests.
The sensible sequence is prototype quickly, test with users, then take the prototype to production properly. That is our prototype-to-production service, from $3,000.
Which one do you need?
- Raising a pre-seed round on an idea: a prototype is usually enough.
- Running a paid pilot with a customer: an MVP.
- Unsure the core technology works: a proof of concept first.