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
DC Metro and Bus - Tracker
DC Metro and Bus is the most trusted transit tracker for Washington DC, with 36,000+ ratings and 13 years of reliable service
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
36,989 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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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 DC Metro and Bus - Tracker: 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 a more reliable data source for real-time information.
Assumption to check: Inaccurate real-time updates for arrivals
Validate with people who use this workflow before building.
Hypothesis 2
Add offline maps and schedules for users without data.
Assumption to check: Limited offline functionality
Validate with people who use this workflow before building.
Hypothesis 3
Enhance the UI/UX for easier navigation and discovery.
Assumption to check: Difficult to navigate the app
Validate with people who use this workflow before building.
Hypothesis 4
Consider a less intrusive ad model or more premium features.
Assumption to check: Frequent ads in the free version
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
DC Metro and Bus is the most trusted transit tracker for Washington DC, with 36,000+ ratings and 13 years of reliable service. Get real-time predictions for every Metro rail line and bus route powered by WMATA data. KEY FEATURES: • Real-Time Predictions - Live arrival times for all Metro rail stations and bus stops, updated every 20 seconds directly from WMATA • Trip Planner - Plan multi-modal trips across Metro rail and bus with step-by-step directions and transfer guidance • DC Metro Map - Full interactive system map with all rail lines, stations, and connections at your fingertips • Bus Stop Finder - Find nearby bus stops using your location with real-time arrival predictions for every route • Rail Alerts - Get notified about service disruptions, delays, single-tracking, and station closures as they happen • Favorites List - Save your most-used stations and bus stops for one-tap access to predictions • Multi-Agency Coverage - WMATA Metrorail, Metrobus and ART (Arlington Transit)data all in one app WHY DC METRO AND BUS: Built by a DC commuter for DC commuters. Unlike generic transit apps that cover hundreds of cities, DC Metro and Bus is purpose-built for the Washington DC Metro Area. Every feature is optimized for WMATA riders in DC, Maryland, and Virginia. With over 36,000 ratings and a 4.5-star average, riders trust DC Metro and Bus to get them where they need to go on time. PERFECT FOR: • Daily commuters on Metro rail and bus • DC, Maryland, and Virginia residents who ride WMATA • Visitors exploring Washington DC by public transit • Anyone who wants to skip the wait and arrive just in time SUBSCRIPTION: Free with ads. Upgrade to Premium for an ad-free experience. Download DC Metro and Bus today and never miss your train or bus again! This app is not published, sponsored or approved by WMATA. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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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 Navigation
Expo Location
Axios
React Native Maps
Zustand
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.
