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
Where's my MBTA Bus?
“Where’s my MBTA Bus?” is an app for Massachusetts transit riders who want to know exactly where their bus is and when it will arrive
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 2.2
150 ratings · Below Average
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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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 Where's my MBTA Bus?: 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 more reliable data sources or algorithms for better accuracy.
Assumption to check: Inaccurate real-time bus tracking
Validate with people who use this workflow before building.
Hypothesis 2
Offer offline maps and saved routes.
Assumption to check: Limited functionality for offline use
Validate with people who use this workflow before building.
Hypothesis 3
Prioritize bug fixing and user feedback integration.
Assumption to check: Poor user ratings due to bugs
Validate with people who use this workflow before building.
Hypothesis 4
Simplify the interface and enhance user experience.
Assumption to check: Cluttered UI with too many elements
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
“Where’s my MBTA Bus?” is an app for Massachusetts transit riders who want to know exactly where their bus is and when it will arrive. It can help riders decide if they need to rush or can restfully finish their morning coffee. Features: - Universal app; supports iPad, iPhone, and iPod Touch - Real-time arrival predictions for ALL MBTA bus stops - Real-time bus locations for ALL MBTA routes - View official MBTA Alerts - Guided navigation to help riders find their stops - View entire route path with all stops on the map - Save stops as Favorites to ensure quick access at any time - Quick access to predictions for the last viewed stop - Automatic refreshing of predictions and bus locations This app relies on MBTA partnership with NextBus inc, to provide real-time bus arrival predictions. Data is provided by NextBus using MBTA raw data. Using their special formula, NextBus is able to provide not only bus locations, but arrival predictions for every single bus stop. The app provides a pre-filled template to report problems, letting riders send feedback and improve the accuracy of predictions. This App requires an Internet connection (3G, 4G, LTE or WiFi) to get access to real-time data.
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 Native
Expo
react-navigation
axios
react-native-maps
expo-location
BUILD KIT DIFFICULTY
Intermediate
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.
