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
NYC Subway Widget
Real Time Metro Departure Times For:
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
345 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/
Preview a sample Build Kit No email needed
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 NYC Subway Widget: 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 offline download for schedules.
Assumption to check: Limited offline functionality for subway schedules.
Validate with people who use this workflow before building.
Hypothesis 2
Add user-configurable alerts for favorite lines.
Assumption to check: Lacks personalized notifications for service changes.
Validate with people who use this workflow before building.
Hypothesis 3
Provide options to navigate using Apple Maps or Google Maps.
Assumption to check: No integration with external navigation apps.
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to customize widget appearance and data.
Assumption to check: Widgets may not be customizable enough.
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
Real Time Metro Departure Times For: — MTA Subway — Bus — NJ PATH — Long Island Railroad LIRR — Metro North — Ferry In the App, on Your Home Screen and Your Lock Screen. The app also includes an offline map of the entire NYC subway system. NYC Subway Widget puts real-time subway departure times right on your home screen or lock screen, so you always know when the next train is arriving at your nearest station. Designed to make commuting in New York City easier, this app gives you instant access to accurate train schedules without needing to open any other apps or search for your location. Here’s how it works: whenever you need an update, just tap the refresh button on the widget. The app will then quickly find your current location, identify the nearest subway stop, and update the widget with the latest departure times. It’s simple and fast—perfect for when the station’s departure displays aren’t working or you just need a quick glance at what’s next. NYC Subway Widget is designed for speed and efficiency. It doesn’t constantly track your location in the background—keeping your privacy intact and saving battery life. Instead, it only checks your location when you hit refresh, giving you the most up-to-date information right when you need it. Once set up, the widget lives on your home or lock screen, ready to update at your convenience. With no customization options or unnecessary features to distract you, NYC Subway Widget focuses on delivering what matters most: the next train’s departure time. Whether you’re commuting to work, running errands, or heading out for a night in the city, this app provides a no-nonsense solution to keeping track of the subway schedule. Just tap refresh and get the latest train times for your closest stop, without the hassle of navigating through complex apps or dealing with station delays. With NYC Subway Widget, you’re always in control. You decide when to check the train times, and the app provides reliable, real-time updates at a glance. Download NYC Subway Widget today and simplify your subway commute with quick, on-demand departure times at your fingertips. EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://spreen.notion.site/NYC-Subway-Widget-Privacy-Policy-12578074aa7f80e7bf33d9017dfe7aee
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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.
