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.
Station Master is an encyclopædia of knowledge of all London Underground, original 84 Overground (pre-June 2015) stations and Docklands Light Railway stations including the best door position for exit at every station...
$8.99 · 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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Generating… usually about a minute.
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 Station Master: map the core Travel 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: Users find it difficult to manage multiple trips efficiently.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of real-time updates for train schedules.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Limited search functionalities make it hard to find specific trips.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: In-app purchases are not transparent.
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.
Station Master is an encyclopædia of knowledge of all London Underground, original 84 Overground (pre-June 2015) stations and Docklands Light Railway stations including the best door position for exit at every station, along with unique 3D Maps showing you the facilities at and layout of ALL 270 Tube stations. Co-created by Geoff Marshall, a two-times Guinness World Record Holder for travelling to all Tube stations in the fastest time possible (a record he held most recently from 2013–2015). http://www.tubeworldrecord.co.uk/ “Tube nerds, prepare to swoon” – Time Out “Save time on the tube with the shortcuts app Station Master” – Evening Standard “It’s a real geek's guide to the tube” – Londonist Prize Winner of "Best App for Accessibility/Step Free Information" - TfL Accessible App Competition - https://www.tfl.gov.uk/info-for/media/press-releases/2013/december/tfl-announce-winners-of-accessible-app-competition The information in Station Master is built-in so it is available at all times underground, without an internet connection. Key features: • Exit information - shows you the correct door to be nearest the exit, interchange corridor, passageways or lift. The only exits App with correct door positions for new S-Stock trains and the new Tottenham Court Road Northern Line station. • 3D Maps and Exit Maps at selected stations (ALL 270 Tube stations covered in 3D!) - visualise a station before you travel there! • Accessibility information - Steps count, lift availability, measurements of gaps onto trains and loads more essential information for wheelchair users, parents with buggies or just those with heavy luggage. • Station facilities - listing toilet information, Wi-Fi availability and more. • Transport Links - to buses, National Rail trains, Cycle hire and River services. • Travel tips, history and fun facts for every station, making your commute less of a chore. Note: Station Master is not a route planning App. London's Transport Network is constantly changing and evolving and we continually update the information in Station Master to reflect changes to the network and from community contributions and corrections.
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.