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.
Raildar – Live UK Train Tracking
$0.95 · 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 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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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 train data coverage
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Difficulties with filtering options
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: In-app purchase confusion
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of real-time updates
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.
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
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.