See your app idea in 5 days
— before
spending €20k+ on development
We turn your idea into a fully clickable prototype with real flows, real content, and developer-ready handover — so you can validate, pitch, and build with confidence.
A prototype an AI builder won't make.
- → Every screen your idea needs
- → Your theme, colors, and concept logo
- → Developer handover doc included
- → Strategic feedback on your idea
- → Mobile + desktop responsive
Don't build blind.
Your developers are excellent, but after 6 weeks of back-and-forth, you discover the UX is wrong.
Or you pitch investors on slides, they fund you, then reality hits when real users see the app.
Validate first. Build once.
A working prototype in your hands by Friday — no code, no waiting, no compromises.
Test with real users. Pitch from something real. Hand to developers with a clear blueprint.
We ship the UI fast.
AI builders are cheap. But they can't reason about your specific business logic or create the nuanced interactions you need. We can—because we've done it 100+ times.
Fresh eyes on your idea
We ask the hard questions: What's broken? Where's the friction? Our strategic feedback often reshapes the entire direction.
Platform expertise
We build for iOS, Android, web, and hybrid. We know what works on each, what's expensive to build, what's worth cutting.
Pixel-perfect design
Not generic templates. Your brand colors, your theme, your personality. It looks like the real thing because it could be.
Developer handover
Componentized, annotated, organized. Your dev team gets flows, logic, and even code hints. They don't reverse-engineer guesses.
Any platform. Any device. Anywhere.
You have an idea. You need proof.
Founders
Test your concept with users before burning runway. Pitch from something real. Secure a dev partner with confidence.
Product leaders
De-risk the roadmap. Validate features before committing engineering. Build alignment with stakeholders fast.
Companies in transition
Spin off new products. Test internal tools. Move fast without dedicating core engineering for 3 months.
Pick a tier. We get to work.
No quotes. No discovery calls. No mystery. Fixed prices, fixed deliverables.
5-7 screens. One platform. 5 days. Perfect for validating with users or pitching investors.
Start now10-15 screens. One platform. 7 days. For a more complete vision of the product.
Start nowUp to 30 screens. Two platforms (e.g. web + mobile). Custom illustrations. 7 days.
Start nowProtobuild vs the alternatives.
| Protobuild | AI Builder | Dev Agency | |
|---|---|---|---|
| Speed | ✓ | ✓ | ✗ |
| Cost | ✓ | ✓ | ✗ |
| Strategic input | ✓ | ✗ | ✓ |
| Pixel-perfect design | ✓ | ✗ | ✓ |
| Custom interactions | ✓ | ✗ | ✓ |
| Developer handover | ✓ | ✗ | ✓ |
| Production ready | ✗ | ✗ | ✓ |
| Flexible timeline | ✗ | ✓ | ✗ |
How a Protobuild gets built.
You send a brief
Tell us what you are building, who it is for, and the problem you are solving. Takes 5 minutes.
We confirm in 24h
We email back with questions, a fixed price, and a start date. If it is a poor fit we say so.
We build
Working clickable prototype. You see progress at day 2-3 and again before delivery.
You decide what next
Test with users, pitch investors, hand it to your dev team. We can help with any of those.
From the workshop.
Words from founders.
"We went from idea to investor pitch in a week. Protobuild let us test the concept without building it first."
"The strategic feedback was as valuable as the prototype itself. They caught design flaws before we built them."
"Handing this to our dev team was seamless. Everything was documented and modular. Saved weeks of back-and-forth."
Things people ask.
Why fixed price? Most studios quote per project. +
What if my idea does not fit a tier? +
Do you build the actual app afterwards? +
Who owns the prototype? +
See your idea, this week.
Send a brief. We reply within 24 hours with a price and a start date. If it is not a fit we will tell you.
Send your brief →