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
AllSubway Universal
This is the best database application of the most important world cities subway maps in your iPhone/iPod touch/iPad/iPad Mini
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.0
3 ratings · Top 30%
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 AllSubway Universal: 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
Expand to more cities based on user demand.
Assumption to check: Limited cities available in the app
Validate with people who use this workflow before building.
Hypothesis 2
Optimize map loading with better caching.
Assumption to check: Occasional map loading issues
Validate with people who use this workflow before building.
Hypothesis 3
Implement real-time updates for schedules.
Assumption to check: Inconsistent schedule updates
Validate with people who use this workflow before building.
Hypothesis 4
Add a review system for user feedback.
Assumption to check: Lack of user reviews for stations
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
This is the best database application of the most important world cities subway maps in your iPhone/iPod touch/iPad/iPad Mini Every traveler should have AllSubway Universal app. ►No internet connection required to view maps. ►Indexed search ►IPortrait or landscape view ►iOS 8.1 ►Optimizations for iPhone 6,6+ ►Print support (exclusive) ►Post the map to Facebook (exclusive) ►Uptodate Underground maps ►Universal mode (Optimized versions for iPhones & iPad in the same application) ►Push Notifications for the addition of new maps ►The best possible memory management comparing to the other Subway applications . New Maps in every new release, stay tuned! Europe : Amsterdam, Ankara, Athens, Barcelona, Basel, Berlin, Berlin Tramway, Bern, Bilbao, Bonn, Bordeaux, Bremen, Brussels, Bucharest, Budapest, Cannes Bus, Catania, Copenhagen, Copenhagen S-Tog, DB Bahn EC IC, DB Bahn ICE, Dresden, Dusseldorf, Erfurt Tram, Erkrath, Essen, Frankfurt, Frankfurt U S Tram, Genoa, Gent, Glasgow, Graz, Haan, Hamburg, Hannover S Bahn, Hannover U Bahn, Heiligenhaus, Helsinki, Hilden, Istanbul, Karlsruhe, Koln, Krakow, Kyiv, Langenfeld, Lausanne, Leipzig, Lille, Lisbon, Lyon, London, London DLR, Madrid, Malaga, Manchester, Marseille, Meerbusch, MerseyRail, Mettmann, Milan, Minsk, Moscow, Munich, Munich Tram, Naples, Newcastle, Norway, NRW Regionalverkehrsplan, Railway, Nurnberg, Oslo, Oslo TramWay, Palermo, Paris, Paris IDF, Paris RER, Porto, Prague, Ratingen, Rennes, Rome, Rotterdam, Ruhrgebiet, Salerno, Seville, Sofia, Stockholm, Stuttgart, Stuttgart S-Bahn, St Gallen, St Petersburg, Strasbourg, Tbilisi, Toulouse, Turin, Valencia, Vienna, Vienna TramWay, Warsaw, Wulfrath, Yerevan, Zurich, Zurich Commuter North America : Atlanta, Baltimore, Boston, Chicago, Chicago Metra, Cleveland, Dallas, Denver, Guadalajara, Hudson Bergen, Las Vegas, Los Angeles, Mexico City, Miami, Minneapolis, Monterrey, Montreal, New Mexico Rail, New York, NY Long Island Rail, NY Metro North Rail, Newark, NJ Transit Rail, Path rail, Philadelphia, Phoenix, Pittsburgh, Portland, San Francisco Bart, Salt Lake City, San Diego, San Francisco Muni, Seattle light rail, Silicon Valley, St. Louis, StPaul, Toronto, Trenton Camden, Vancouver, Washington South America : Buenos Aires, Caracas, Lima, Medellin, Rio De Janeiro, Santiago de Chile, Sao Paulo Africa : Cairo, Johannesburg, Tunis, Tunis TGM Asia : Almaty, Baku, Bangkok, Bangkok Sky Train, Beijing, Changchun, Chengdu, Chennai, Chongqing, Dalian Rail, Dubai, Fukuoka, Guangzhou, Hangzhou, Harbin, Hong Kong, Kaohsiung, Kolkata, Kuala Lumpur, Kunming, Kyoto, Manila, Mumbai MonoRail, Mumbai Suburban, Nagoya, Nanjing, New Delhi, Osaka, Sapporo, Seoul, Shanghai, Shanghai English, Shenyang, Shenzhen, Singapore, Suzhou Jiangsu, Taipei, Tashkent, Tehran, Tianjin, Tokyo, Tokyo English, Tokyo JR-East, Wuhan, Xian, Zhengzhou Australia : Adelaide, Brisbane, Melbourne, Perth, Sydney
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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
Supabase
react-navigation
react-native-maps
zustand
BUILD KIT DIFFICULTY
Starter
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.
