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
NZ Charts
This App contains the complete set of LINZ hydrographic raster charts for New Zealand
$2.99 · In-app purchases
PRICE
$2.99
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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Build Kit
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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.
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for NZ Charts: map the core Navigation 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
Ensure smooth offline access with pre-downloaded charts.
Assumption to check: Navigation apps often suffer from poor offline capabilities.
Validate with people who use this workflow before building.
Hypothesis 2
Optimize map loading times and provide real-time updates.
Assumption to check: Maps can be slow to load or update.
Validate with people who use this workflow before building.
Hypothesis 3
Focus on a clean, user-friendly design with clear navigation.
Assumption to check: User interface can feel cluttered or confusing.
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to customize waypoints and save preferred routes.
Assumption to check: Limited customization for saved routes.
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
This App contains the complete set of LINZ hydrographic raster charts for New Zealand. The charts are all installed with the app for out-of-the-box offline use with no additional downloads needed, and no account signup or additional subscription costs. The App also includes full navigational functionality including creating and following routes, import/export of routes, trip logging, trip planning. Additional features include display of DOC huts and campgrounds, DOC walking tracks, tide stations with tide data, sunrise/sunset calculations, marine reserve and mammal sanctuary boundaries. Land features can be recreated in an augmented reality view using your device's camera to help identify surrounding peaks and topography. If your device has GPS capability then this can be used to display your location, speed, bearing, and to record your trips. As with any App, using the GPS will increase battery consumption. This App does not replace the requirement for carrying navigation charts where this applies.
Written user reviews are not shown here. Check current App Store reviews >
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 Native
Expo
Axios
React Navigation
React Native Reanimated
Expo Location
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.
