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.
App Overview
Madobe: Shinkansen Guide
See what is outside the window of your Shinkansen.
$2.99
PRICE
$2.99
No 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 included
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.
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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
See what is outside the window of your Shinkansen. - Before you board: the first screen answers "Mt. Fuji is on the Seat E side" and "In Green cars it is seat D." This holds in both directions. - Live guide on board: tap start, and the app follows your position along the line by GPS. It announces "In 1 min 30 sec, Seat E side" ahead of each highlight, then "Mt. Fuji, Seat E side" while it is visible. - Automatic left/right: the side is computed from the map bearing of the sight and the direction the train is running, so it flips correctly on up-bound trains. - Keeps going in tunnels: when GPS drops, the app estimates your position from your last speed and shows "In tunnel (estimating position)." - Live Activity: the countdown to the next highlight appears on the Lock Screen. - 85 highlights: 55 on the Tokaido Shinkansen and 30 on the Sanyo Shinkansen, across mountains, rivers, sea, lakes, castles, cities, bridges and tunnels, each with a photo tip and the best seasons. - Next station and current speed, in km/h or mph. - Japanese and English, following the system language or set by hand. The app makes no network requests. Your location stays on the device. No account, no ads. Route and station positions are derived from the National Land Numerical Information (Railway Data) published by the Ministry of Land, Infrastructure, Transport and Tourism of Japan.
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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.
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
BUILD KIT DIFFICULTY
Not assessed in a Build Kit yet.
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.
