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
Metro Paris Subway
Metro Paris Subway is the original and No
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
413 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 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 Metro Paris Subway: 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
Integrate a live update feature for subway schedules.
Assumption to check: The app may not have real-time updates on subway status or delays.
Validate with people who use this workflow before building.
Hypothesis 2
Offer more ticket types and promotions.
Assumption to check: Limited ticket options may frustrate users.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify navigation and enhance user-friendliness.
Assumption to check: User interface can feel cluttered with too many elements.
Validate with people who use this workflow before building.
Hypothesis 4
Streamline the purchase flow with clearer prompts.
Assumption to check: In-app purchase process may be confusing.
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
Metro Paris Subway is the original and No. 1 selling application for getting around Paris, France. ◉ Metro Paris Subway is recommended by the Financial Times and the Los Angeles Times. Featured by Apple. ************************************************************ DESCRIPTION ************************************************************ Metro Paris Subway for iPhone is a comprehensive guide to traveling through Paris, France. It includes official subway maps. Metro Paris Subway is officially licensed by RATP of Paris. ◉ Latest official map of Paris Metro, RER (the additional regional express network of Paris) and Paris Bus. Detailed map of each line in Paris (Metro, RER, Tramway, and SNCF Transilien). ◉ Precise location of each station on the map (with a red circle). This application is fully compatible with Apple Maps, each station is represented by a red pin, a popup shows you the distance, and it's updated live (thanks to GPS) as you walk down the streets of Paris. ◉ The journey planner tool allows you to find automatically the best route to get to your destination in Paris Metro. Interactive map to choose your stations for the route. To get better Route results, please switch into Best Route in the settings. ◉ The journey planner does not require a network connection to operate, it works perfectly while in the subway. ◉ A bookmark manager allows you to save your stations and routes. ◉ The application locates the nearest metro stations from your position in Paris. You can also provide an address in Paris, all the stations closest to that address will be displayed. ◉ Paris Bus is now available in the same application. This option allows you to switch between the underground and bus systems at any time using the same application. This add-on includes the official Paris Buses map from RATP with the key bus routes, locates the nearest bus stations, and also offers a Journey Planner tool. ◉ This application is available in English, French, Spanish, German and Japanese. Thank you for taking the time to report any bugs or to request an enhancement to Metro Paris Subway Application. Email us at [email protected]
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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
react-navigation
axios
react-native-maps
Zustand
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.
