App Overview

Raildar icon

Raildar

Arc Internet Ltd · Travel

Raildar – Live UK Train Tracking

$0.95 · In-app purchases

PRICE
$0.95
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet

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 included16 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 Raildar: 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

Expand data sources for better coverage.

Assumption to check: Limited train data coverage

Validate with people who use this workflow before building.

Hypothesis 2

Improve filtering UX for easier train selection.

Assumption to check: Difficulties with filtering options

Validate with people who use this workflow before building.

Hypothesis 3

Clarify subscription benefits and simplify the purchase process.

Assumption to check: In-app purchase confusion

Validate with people who use this workflow before building.

Hypothesis 4

Integrate real-time tracking for trains.

Assumption to check: Lack of real-time updates

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

Raildar – Live UK Train Tracking See the UK rail network come alive in real time. Raildar accurately plots the live location of trains across the entire UK rail network, giving you a clear picture of where your train is right now - not just when it was scheduled. Whether you’re commuting, waiting for a connection, or just a rail enthusiast, Raildar lets you: - View live positions of trains across the UK - Search for a specific service and follow it on the map - Check where your train has been earlier today - Pan around the map to explore rail activity nationwide Simple, fast, and built for anyone who wants to know what’s really happening on the rails. Raildar Subscription (Optional) Keeping live train locations up to date for the entire UK network is data-intensive and keeps our servers busy. To keep the app free for everyone, Raildar uses a short live-update timeout in the standard version. With Raildar Subscription, you unlock a smoother, more powerful experience: - Extended live tracking without frequent timeouts - No adverts - Extra train details, including headcodes - A more seamless, uninterrupted map experience Subscriptions are available monthly, or for 6 months at a discounted monthly rate. You can try Raildar Subscription free for 7 days before committing. Subscription Details Payment will be charged to your iTunes account at the end of the free trial Subscription renews automatically unless cancelled at least 24 hours before the end of the current period Your account will be charged for renewal within 24 hours of the subscription ending You can manage or cancel your subscription at any time via your Account Settings (using the “Manage” button on the Upgrade page) Any unused portion of a free trial is forfeited once a subscription is purchased Subscription fees are non-refundable; no refunds are given for unused time if cancelled Full terms and conditions can be found at https://raildar.co.uk/appterms.html

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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.

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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.