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.
Tube Map Pro uses the official Tube Map from Transport for London (TfL) with live travel information and a journey planner – all free from adverts.
$25.99 · 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.
First kit free with a verified email
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 Tube Map Pro: 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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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 offline functionality
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: User interface can be cluttered
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Occasional map loading issues
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Inadequate search results
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.
Tube Map Pro uses the official Tube Map from Transport for London (TfL) with live travel information and a journey planner – all free from adverts. This app is the Pro version of Mapway's award-winning Tube Map which has over 22 million downloads worldwide. Key features: Uses the official TfL iconic Harry Beck London Underground map design. Includes additional map views for the TfL Night Tube and Rail Network. Plus a bonus map that we have created that is more geographical. An easy to use journey planner that works with and without an internet connection. Check line status for delays, closures and service changes. See what time the next Tube is due with live departures from TfL. National Rail arrivals and departures. Journey planning made easy with real-time routing around closures and delays. Use step-by-step directions in the journey planner to find your way around London. Save your favourite routes for quick selection when on the go. Save your Home and Work stations for up to date station, line and route information. Find your closest Tube station wherever you are in London. Tube Map Pro Apple Watch app available. Travel Guide First & Last Tube Times, Tube Exits Line status widgets With over 55 million downloads worldwide, there's a Mapway app for many of the busiest transport systems in the world including New York Subway, Paris Metro, Bus Times London and Berlin Subway. Plan. Route. Relax. Please note: whilst we endeavour to ensure that Line Status notifications are delivered in a timely manner we can’t guarantee this 100% of the time. There may be occasions when the functionality isn’t available due to technical reasons outside of our control.
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.