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
Bus New York City
** NEW ** Realtime Subway Departures powered by MTA Subway Time- just $0.99 as an in-app-add-on!
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
1,438 ratings · Top 15%
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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Bus New York City: 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 offline mode with cached data for routes and stops.
Assumption to check: Limited offline functionality for users without data access
Validate with people who use this workflow before building.
Hypothesis 2
Simplify the purchase flow and provide clearer benefits of premium features.
Assumption to check: In-app purchase complexities can confuse users
Validate with people who use this workflow before building.
Hypothesis 3
Enhance real-time tracking and provide user feedback options.
Assumption to check: Occasional inaccuracies with bus arrival times
Validate with people who use this workflow before building.
Hypothesis 4
Streamline UI with clearer navigation and fewer distractions.
Assumption to check: User interface can be cluttered
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
** NEW ** Realtime Subway Departures powered by MTA Subway Time- just $0.99 as an in-app-add-on! BUS NYC IS THE MOST FEATURE RICH NEW YORK CITY BUS APP AVAILABLE, ENHANCED WITH MTA BUS TIME. *** Winner at the MTA AT&T App Quest Awards! *** Features: ################## * Find out when the next buses are scheduled to arrive. * With MTA Bus Time®, we can give you live departure info and bus positions for all MTA buses in New York. * **NEW** Realtime Subway departures for the 1, 2, 3, 4, 5, 6, L and S (42 St Shuttle), all for just $0.99! More realtime routes will be added as they become available. * View full bus timetables for a selected service even when you don't have an internet connection e.g. find out when the last bus is scheduled to leave. * View official MTA route maps for the Subway and the bus networks in Manhattan, Brooklyn, Queens, the Bronx & Staten Island. * Find out latest news that might affect your daily commute, as well as status updates for bus, subway, rail, bridges & tunnels. * Add stops to your favorites so you can quickly find out when your next buses are due to arrive. * View bus routes on the map and find out where they go. * Search for a location or pin point your current position on the map so you can find nearby bus stops. * Use the official MTA Journey planner to find out how to get from A to B. * Lots of information about the MTA, including fares and MetroCards, FAQs, accessibility, contact details, how to get to and from the airports and lots more. * Find out the latest news about your transport network, including improvements and innovations. * Plus: many of the features work offline! Use it whilst on the Subway, or when you have no signal. Be green! Let's try and get more people using public transport in New York City! We love to receive feedback :) Email us at [email protected] for comments or suggestions you have about the app. This app was produced by Electric Labs Ltd under licence from the Metropolitan Transportation Authority (MTA). For a full list of supported bus routes, please visit: http://www.electriclabs.com/bus-new-york-city/route-list
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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.
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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.
