When you commission a prototype or MVP, vague promises and hand-wavy timelines will burn your budget fast. You need to know exactly what tangible deliverables you're getting—and in what format—before you sign a contract.
Define What "Done" Actually Means
Most prototype development projects fail because the customer and developer have different ideas of completion. A prototype isn't just working code; it's a package of assets, documentation, and access rights that prove your concept is viable and ready for the next phase.
Before hiring, ask for a detailed deliverables checklist. This should specify whether you're getting source code, design files, infrastructure setup, user testing reports, or all of the above. A typical MVP scope might include a functional web or mobile app, basic UI/UX design, and a deployment environment—but "typical" varies wildly depending on your industry and goals.
The Core Deliverables Checklist
Your prototype development contract should guarantee these items:
- Working application or software build – Functional code that demonstrates your core feature set, running on a staging or live environment
- Source code and repositories – Complete, clean, commented code that you own outright (not locked into proprietary platforms)
- Design files and assets – Figma links, Sketch files, or Adobe XD projects showing UI mockups, wireframes, and design specifications
- Technical documentation – Architecture diagrams, API documentation, database schema, and setup instructions so another developer can maintain or scale it
- Testing and QA reports – Evidence of user testing, bug fixes, and performance benchmarks specific to your target use case
- Deployment guide – Step-by-step instructions for deploying to production, plus any required credentials or environment variables
- Post-launch support period – Usually 30–90 days of bug fixes and minor adjustments included in the base price
Not every project needs every item, but you should consciously exclude items, not accidentally discover they're missing at handover.
Timeline Expectations and Milestones
A typical prototype takes 8–12 weeks for a simple web app, 10–16 weeks for a mobile app, and 12–20 weeks for something requiring API integrations or complex backend logic. More realistic than a single deadline is a milestone-based delivery schedule:
- Week 2–3: Design mockups and architecture approved
- Week 5–6: Core features coded and demonstrated
- Week 8–10: Full functionality with basic testing
- Week 11–12: Bug fixes, documentation, and handover
Ask your developer for a Gantt chart or sprint breakdown upfront. If they can't articulate when you'll see working features, they haven't thought through the project.
Pricing and What's Included
MVP and prototype costs typically range from $15,000 to $100,000+, depending on complexity and team location. Hourly rates for specialized developers run $50–$150/hour in Eastern Europe and Latin America, $100–$250/hour in North America, and $150–$300+/hour for top-tier agencies.
Watch for hidden costs: hosting, third-party API subscriptions, design tool licenses, and post-launch support are often billed separately. Ask whether your quote is fixed or hourly, and what triggers change orders. A good provider will bundle essential infrastructure (database, hosting, CDN) into the base price for the first three months.
Ownership and Licensing
This matters more than most customers realize. You must own the source code outright, not rent it. Avoid contracts that lock you into ongoing monthly licensing fees or require the developer's continued involvement for basic maintenance.
Clarify intellectual property in writing: who owns the design assets, code repositories, and any reusable components the developer creates? A responsible shop will transfer full ownership to you on final payment.
How to Compare Providers
When evaluating quotes, don't just look at price and timeline. Request references from similar projects—ask those customers specifically whether they received all promised deliverables on time and if they could operate the product independently afterward.
Use Mercoly to compare and find trusted MVP and prototype development providers side-by-side, with verified reviews and detailed scope breakdowns in one place.
Frequently Asked Questions
Q: Should I insist on weekly demos during development? Yes—request working demos every sprint (1–2 weeks) so you catch misaligned expectations early and can redirect effort before wasted cycles pile up.
Q: What happens if the developer disappears after handover? Insist that all credentials, repositories, and documentation transfer to accounts you control, and negotiate a 30–60 day post-launch support window for critical bugs.
Q: Can I use a prototype as my production app? Not directly—prototypes are proof-of-concept, not built for scale. Plan to rebuild or refactor with a focus on performance, security, and user load once you validate your market.
Ready to find the right developer? Compare transparent, detailed proposals from vetted MVP and prototype shops today.