Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
App Overview
1 Euro — Paid Nothing App
1 Euro is a minimalist paid app
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included14 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Differentiate and validate
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for 1 Euro — Paid Nothing App: map the core Entertainment workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Hypothesis 1
Incorporate user-generated content or broader categories.
Assumption to check: Limited content variety may lead to user boredom
Validate with people who use this workflow before building.
Hypothesis 2
Introduce a pay-per-item model alongside subscriptions.
Assumption to check: High subscription fees can deter users
Validate with people who use this workflow before building.
Hypothesis 3
Enable content sharing and user feedback features.
Assumption to check: Lack of social features like sharing or user reviews
Validate with people who use this workflow before building.
Hypothesis 4
Implement an algorithm to suggest content based on user preferences.
Assumption to check: No personalized recommendations
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
1 Euro is a minimalist paid app. It shows a single bold line of text. Tap to see another line. That is the entire experience. This is a tiny monument to unnecessary purchases. It is honest, simple, and intentionally empty. WHAT YOU GET • One bold sentence at a time • Tap to get a new line • Clean, all-white aesthetic • No accounts, no ads, no tracking WHY PEOPLE BUY IT Some apps promise everything. This one promises nothing — and delivers. It is a conversation starter. A statement. A tiny rebellion against apps that demand your attention, your data, and your time. THE EXPERIENCE Open the app. Read the line. Tap for another. Close it. Come back tomorrow for something new. Or don't. There are no notifications. No achievements. No pressure. Just words. PERFECT FOR • Anyone who has bought something they didn't need • People who appreciate minimalism • Those who enjoy absurd humor • Collectors of unique apps PRIVACY FIRST No data collection. No analytics. No internet connection required. Your 1 Euro experience is entirely yours.
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
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BUILD KIT DIFFICULTY
Starter
From the Build Kit assessment.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.
