Prototype vs MVP: what should you build first?
Choose the right level of fidelity by matching the thing you build to the uncertainty you need to remove.
They answer different questions
A prototype helps people react to an experience before the full system exists. An MVP is a working release used in a real context. Treating them as interchangeable either makes prototypes unnecessarily expensive or sends unfinished software to users too early.
Use a prototype to test comprehension, flow, desirability or a difficult interaction. Use an MVP when the question depends on real behaviour, real data, repeated use or willingness to pay.
Prototype when change should be cheap
Early in a product, the most valuable activity is often changing the shape of the idea. A clickable flow, coded interaction or manual service simulation can expose a weak mental model before infrastructure hardens around it.
The prototype only needs enough fidelity for the question. A navigation test does not need production data. A new AI interaction may need working model output because static screens cannot reveal latency, quality or failure behaviour.
- Test whether people understand the proposition
- Compare alternative journeys
- Expose operational gaps
- De-risk a technically unusual interaction
Build an MVP when reality is the test
Move to an MVP when the remaining questions require a live system: will people return, complete the core job, invite someone else, connect their data or pay? Those signals cannot be obtained reliably from a demonstration alone.
An MVP still needs to feel complete around its narrow promise. Reliability, privacy, support and empty states are part of the product when real users depend on them.
The strongest route often uses both
Prototype the most uncertain parts first, learn quickly, then build the smallest live system that preserves the validated journey. The sequence reduces expensive rework without pretending that user interviews or polished mockups can replace market evidence.
The choice is not about appearing more advanced. It is about buying the next piece of truth at the right price.