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.
Railways Map is a powerful, easy-to-use iOS app that brings the entire world's railway infrastructure to your fingertips
$0.99 · In-app purchases
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.
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.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Railway Map - OpenRailwayMap: map the core Reference workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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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
Assumption to check: Limited map features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: User interface can be confusing
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Inconsistent data about stations
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of offline functionality
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Railways Map is a powerful, easy-to-use iOS app that brings the entire world's railway infrastructure to your fingertips. Based on the OpenRailwayMap project, it overlays global railway data directly onto standard and satellite Apple Maps. Explore railways in three detailed viewing modes: - Infrastructure: See tracks, stations, sidings, depots, and more - Train Protection and Signals: View signal systems, safety infrastructure, and control technology - Maximum Speed: Visualize the speed limits across the railway network A built-in legend is always accessible, helping you understand every color and symbol on the map in real time. The app includes a powerful search feature to locate stations, addresses, or any point of interest around the world with ease. Automatically draw complex multi-stop railway routes across the network with intelligent pathfinding between stations and waypoints. To ensure a smooth experience, all railway data is cached locally as you browse, allowing for faster access to previously viewed areas. You can clear the cache at any time to free up disk space. Whether you are a railway enthusiast, professional, or simply curious about the rail networks around you, Railways Map offers a comprehensive and intuitive mapping experience.
Written user reviews are not shown here. Check current App Store reviews >
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.