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
Bonjour RATP
Bonjour RATP, the #1 app for public transport in Île‑de‑France.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
2,006 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 included18 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 Bonjour RATP: map the core Navigation 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 full offline maps and route planning.
Assumption to check: Limited offline functionality
Validate with people who use this workflow before building.
Hypothesis 2
Optimize API calls and caching mechanisms.
Assumption to check: Slow loading times during peak hours
Validate with people who use this workflow before building.
Hypothesis 3
Add user profiles and saved journeys.
Assumption to check: Lack of personalized features
Validate with people who use this workflow before building.
Hypothesis 4
Enhance data accuracy with better sources and algorithms.
Assumption to check: Inaccurate real-time data
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
Bonjour RATP, the #1 app for public transport in Île‑de‑France. Plan your trips, check live traffic, purchase your tickets, and discover all mobility alternatives around you - metro, RER, bus, tram, Transilien trains, and self-service bikes. Your routes across all networks. Metro, RER, bus, tramway, Transilien SNCF trains, Optile… Wherever you are, Bonjour RATP finds the best journey to get you around the entire region. Journeys tailored to you. Customize your search according to your preferences: - Avoid certain lines or stations, - Prioritize your preferred modes (metro, RER, Transilien, bus…), - Minimize transfers or favor accessible routes. Because every resident of Île-de-France has their own way of traveling. Real-time traffic and personalized alerts. Check the network status at a glance and receive real-time alerts in case of disruptions on your favorite lines across the entire Île-de-France network. All your tickets in your pocket. No more monthly queues! Buy the following tickets in the app and access them directly on your iPhone or Navigo pass: - Navigo Month - Navigo Week - Navigo Day - Metro-Train-RER tickets - Bus-Tram tickets - Paris Region-Airports tickets - Special tickets (Music Festival, Anti-pollution pass...) - Paris Visite pass Always on time. Check real-time schedules for upcoming departures on all your lines. Never miss your bus, metro, or RER again. An incident on your lines? Thanks to alerts, you’ll be immediately informed and the app will suggest an alternative. Speak and go (Beta) Just say where you want to go, and Bonjour RATP takes care of the rest! Voice search makes your journeys even easier. Bike sharing Want to ride? Find a bike in seconds. Bonjour RATP shows availability of Vélib’, Lime, Dott and Voi. Why choose Bonjour RATP? - Complete coverage across all Île-de-France - Customizable routes based on your preferences and habits - Real-time traffic and alerts - All tickets and passes directly in the app - All self-service bikes available - Smooth, clear, and intuitive interface For more information about our services, feel free to contact us by email at [email protected] Source: leading public transport app ranking — Médiamétrie // NetRatings, April 2026.
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 Navigation
Expo Location
Axios
React Native Maps
Async Storage
BUILD KIT DIFFICULTY
Advanced
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.
