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
Schengen Calendar
Overstaying the Schengen limit can mean fines, deportation, or a travel ban
$2.99 · In-app purchases
PRICE
$2.99
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 included15 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 Schengen Calendar: map the core Travel 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
Implement a clear visual representation of travel days on the calendar.
Assumption to check: Users struggle with managing travel dates effectively.
Validate with people who use this workflow before building.
Hypothesis 2
Provide curated travel tips and links to official resources.
Assumption to check: Limited tips and resources for travelers.
Validate with people who use this workflow before building.
Hypothesis 3
Incorporate user-generated content or community tips.
Assumption to check: Lack of user engagement features.
Validate with people who use this workflow before building.
Hypothesis 4
Add reminders and alerts for visa expiration or required travel days.
Assumption to check: Difficulties in tracking visa days accurately.
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
Overstaying the Schengen limit can mean fines, deportation, or a travel ban. Don't let confusing math ruin your European adventure. Schengen Calendar takes the stress out of the 90/180 rule. See exactly how many days you have left, plan future trips with confidence, and never worry about accidentally overstaying again. WHY TRAVELERS LOVE IT Instant clarity — Open the app and immediately see your days used and remaining. No spreadsheets, no guesswork. Plan trips safely — Add a future trip and instantly see if it's within your limits. Know before you book. Visual calendar — See your entire travel history at a glance. Tap any day to check that date's exact Schengen score. Score projection — A chart shows how your allowance changes over time, so you can find the perfect window for your next trip. Offline ready — Your data stays on your device. Check your status anywhere, anytime. WHO IT'S FOR Digital nomads hopping between countries. Frequent business travelers. Anyone visiting loved ones across Europe. If you need to track the 90/180 rule, this app makes it effortless. THE 90/180 RULE, SIMPLIFIED Non-EU visitors can spend up to 90 days in the Schengen Zone within any rolling 180-day period. Sounds simple—until you try to calculate it across multiple trips. We handle the math so you can focus on your journey. Disclaimer: This app is a planning tool and does not guarantee entry or legal stay. While we strive for accuracy, always verify dates with official sources and comply with immigration requirements. The developer is not responsible for any outcomes related to its use.
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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
React Native
Expo
Zustand
react-navigation
expo-calendar
BUILD KIT DIFFICULTY
Intermediate
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.
