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
St. Peter's Basilica Guide
St
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 ratings · Top 5%
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 included17 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 St. Peter's Basilica Guide: 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
Include user-generated content or reviews to enhance offerings.
Assumption to check: Limited content on less popular tours
Validate with people who use this workflow before building.
Hypothesis 2
Implement a guided tour feature for newcomers.
Assumption to check: Navigation can be confusing for first-time users
Validate with people who use this workflow before building.
Hypothesis 3
Use a standardized recording process for audio tours.
Assumption to check: Audio quality varies across tours
Validate with people who use this workflow before building.
Hypothesis 4
Add a dedicated section detailing what each purchase includes.
Assumption to check: In-app purchases are not clearly explained
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
St. Peter's Basilica Guide is the essential companion for every visitor to the Vatican. Whether you're planning ahead or exploring in the moment, everything you need is right in your pocket. FEATURES: - Interactive Map — Navigate St. Peter's Basilica with detailed points of interest, chapels, altars, and landmarks clearly marked. - Mass & Prayer Times — Current daily Mass times, Confession schedules, and Eucharistic Adoration hours so you never miss a service. - Papal Grottos — Explore the sacred burial place beneath the basilica. Every pope laid to rest there with images, history, and details about their pontificate. - Visitor Information — Opening hours, dress code requirements, entry rules, and practical tips to make the most of your visit. - Offline Support — Download content before your trip and use the app without an internet connection inside the basilica. - 7 Languages — Available in English, Italian, Spanish, French, German, Polish, and Portuguese. A must-have for Catholic pilgrims, tourists, and anyone visiting one of the world's most sacred and historic sites.
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
React Native
Expo
Supabase
React Navigation
React Native Maps
Expo AV
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.
