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
Ghost Walk in Old Town
Discover the Old Town (Gamla Stan) in a frightfully good way!
$3.99 · In-app purchases
PRICE
$3.99
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 included16 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 Ghost Walk in Old Town: 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 robust review system to encourage user feedback.
Assumption to check: Limited user reviews and ratings for guidance.
Validate with people who use this workflow before building.
Hypothesis 2
Include advanced filtering and search options.
Assumption to check: Potential difficulty in discovering tours.
Validate with people who use this workflow before building.
Hypothesis 3
Streamline booking with simpler forms and payment options.
Assumption to check: Booking processes can be cumbersome.
Validate with people who use this workflow before building.
Hypothesis 4
Add an in-app chat feature for real-time assistance.
Assumption to check: Lack of in-app messaging for user support.
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
Discover the Old Town (Gamla Stan) in a frightfully good way! An interactive time-travel adventure for curious kids and brave adults. Forget ordinary guided tours. Step into a darker, eerier — and at times foul-smelling — Stockholm alongside your two young guides. From Ghost Walk Stockholm – the official app for those who want to experience the Old Town for real. You don’t just listen. You’re part of the story. No made-up horror stories. This is where Stockholm’s most dramatic and gripping history unfolds — right around you. You stand exactly where it happened. In narrow alleys where whispers could be fatal. In town squares where fates were decided before a trembling crowd. Thrilling. Immersive. Easy to follow. No bookings. No stress. No large groups. Start whenever you like — and bring history to life. What makes this experience different? - Dramatised storytelling – spine-tingling, 100% true history brought vividly to life - Self-guided experience – start when you want, pause anytime. Explore at your own pace. - Historic & haunted locations – stand where history truly unfolded - Real-time GPS map – navigate the winding streets of Stockholm’s Old Town with ease - Interactive video quizzes – engaging fun for all ages, with a prize at the end - AR visuals – see historic objects up close - Also included: A carefully curated Old Town guide, featuring hand-picked cafés, museums, restaurants and independent shops - perfect when you want to combine your ghost walk with even more things to do in Stockholm. Perfect for… • Families who want something far more unique than a typical walking tour • Teenagers who want more excitement than another Netflix series • A first date that needs a spark of mystery (and maybe a reason to hold hands) • Friends in town ready to step into the city’s darker past • Stockholm locals who think they’ve seen it all – until now Available in English and Swedish. Learn more at GhostWalkStockholm.com History has never felt this close. Do you dare to experience what really happened?
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.
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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.
