App Overview

Station Master icon

Station Master

Frostmd LLP · Travel

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

PRICE
$8.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
5.0
10 ratings · Top 5%

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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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.

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.

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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> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
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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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 dashboard that consolidates all trip information in one view.

Assumption to check: Users find it difficult to manage multiple trips efficiently.

Validate with people who use this workflow before building.

Hypothesis 2

Integrate real-time notifications for schedule changes.

Assumption to check: Lack of real-time updates for train schedules.

Validate with people who use this workflow before building.

Hypothesis 3

Enhance the search feature with filters for time, price, and duration.

Assumption to check: Limited search functionalities make it hard to find specific trips.

Validate with people who use this workflow before building.

Hypothesis 4

Provide clear information about what features are included with purchases.

Assumption to check: In-app purchases are not transparent.

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

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.

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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
@supabase/supabase-js
React Native Reanimated
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.