In plain language: a prototype is the architect's cardboard model. An MVP is a home someone can actually live in. Founders get charged dearly for confusing the two.
Why this matters
The words get used interchangeably in calls and contracts, and the confusion becomes a budget the moment a quote is signed: a founder pays cardboard-model money, expects move-in-ready outcomes, and the gap between them, real logins, real payments, real data, real edge cases, surfaces mid-build as shock.
The common mistake
A vocabulary mistake becomes a budget mistake the moment a quote is signed, which is why the single most valuable sentence in any build contract is the one naming which of the two you're buying.
How we approach it
The clean split: a prototype answers 'does this look right?', clickable screens, fake data, no accounts, built in days, perfect for collecting opinions from users and investors. An MVP answers 'will people actually use this?', real data, real accounts, real payments, and the invisible 80 percent no demo shows, built in weeks, because evidence costs more than opinion. Both are the right tool; they're just tools for different jobs.
A checklist you can use
Prototype = the cardboard model; MVP = the livable home
Prototype answers 'does it look right?' — days, fake data
MVP answers 'will people use it?' — weeks, real payments
The confusion becomes a budget the moment a quote is signed
Name which one you're buying, in the contract
When to bring in help
Before your next build conversation, write one sentence: 'We are buying a prototype/MVP because we need opinions/evidence.' Put that sentence in the contract, and the mid-build shock never arrives. If the honest answer is that nobody on the team owns this end to end, that's the moment to borrow the depth rather than improvise it.
Takeaway
Decide which question you need answered, opinions or evidence, and the scope, timeline, and budget stop being negotiations and start being math.
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