One day. One problem. One working prototype. With App in a Day, we make your idea tangible on the very same day: thanks to AI and vibecoding, we build a working app that you can not only test, but actually use.
What does App in a Day deliver?
Working prototype
No mockup, no report, but an app you click through yourself
Faster decisions
By the end of the day there's something you can actually decide on
Less risk
Invest one day before committing a development budget
Straight ahead
The outcomes are immediate input for the next step
Why App in a Day?
Here's what's included, for €1,900
At 5 PM, this is what you walk away with:
- A working prototype you can click through yourself
- Problem analysis and key insights
- A concrete action plan
- A substantiated go/no-go advice
- A slide deck with all outcomes
One fixed day rate, no post-calculation. Preparation, facilitation and delivery included.
The day consists of five steps. At the end, there is always something that works:
- 1
Kick-off (30 min)
We start the day by sharpening the goal, the context and the expectations. What is the problem we are tackling today, and what needs to be delivered by the end of the day?
- 2
Zoom in on the problem (60 min)
We dive deeper into the challenge. What is the real problem behind the problem? By properly defining what is going on, we prevent building the wrong solution later.
- 3
Brainstorm solutions (90 min)
With the problem clearly in view, we explore ideas and possible solution directions. Together we choose the most promising direction to work out.
- 4
Build (3 hours)
The real work: we build a working prototype live, with you present. No mockup, no sketch, an app you can click through yourself at the end of the day.
- 5
Demo & next steps (60 min)
We present what has been built, discuss the outcomes and determine what the next step is. You leave the day with a working prototype and a concrete action plan.
Meet our team
The App in a Day is guided by a Facilitator and a Business Analyst/UX specialist from Product League. You bring three to six people who know the problem. Everything on location, at your place or ours, lunch included. Nothing to prepare.
Why one day is enough
App in a Day is the starting engine: one day to prove the idea works, before you invest in development. No decks, no demos from someone else. Your own people help build it, so buy-in happens naturally and no one needs convincing afterwards.
The approach follows the double diamond method: first finding the right problem, then solving that problem right. This prevents spending months building something that doesn't address the real issue.
Invest one day to avoid building for months.
From App in a Day to live product
App in a Day is phase one of a proven journey:
Phase 1 - App in a Day (1 day)
Choose one problem and build a working prototype for it live.
Phase 2 - Design Sprint / Opportunity Scan (1–2 weeks)
Go deeper into users, scope and business case. Know what's needed.
Phase 3 - Development (weeks to months)
Build the real application in short iterations, with your team involved.
Phase 4 - Continuous improvement (ongoing)
Measure, refine and expand based on real usage.
Get in touch
One day is all you need to know if the idea is worth it.
FAQ
What exactly is 'vibecoding'?
Vibecoding means using AI to go from a plain-language description to working software, quickly. Useful for making ideas tangible in a short time. We use it where it delivers speed, with an expert checking quality along the way.
Can we really pull this off in one day?
For most ideas, yes. The exact time depends on complexity, but the starting point is: you begin the morning with a description and end the day with something working that you can test.
Is the app the same as the real product?
No. An app built during App in a Day is meant for learning and testing, not for running in production. What you learn is then used to build the real product properly.