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
Topo maps - Norway
Topo maps - Norway puts Kartverket's detailed topographic map of Norway right in your pocket
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.0
1 ratings · Top 30%
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 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.
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.
// RORK SYSTEM PROMPT
Rork plan preview for Topo maps - Norway: 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
Implement offline caching to enhance performance.
Assumption to check: Maps can be slow to load in areas with poor connectivity.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to customize map settings and layers.
Assumption to check: Limited user customization options for map layers.
Validate with people who use this workflow before building.
Hypothesis 3
Provide clear descriptions and benefits of premium features.
Assumption to check: In-app purchases can be unclear or confusing.
Validate with people who use this workflow before building.
Hypothesis 4
Enhance search functionality with filters and categories.
Assumption to check: Difficulty in finding specific locations or trails.
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
Topo maps - Norway puts Kartverket's detailed topographic map of Norway right in your pocket. From fjord paths and mountain plateaus to forest cabins and coastal trips, you've got a clear outdoor map that works even without a signal. The map covers Norway at practical outdoor scales and looks sharp on Retina displays. What's inside - Full offline use — download any area to your device and leave reception behind - Tracks and waypoints, with GPX import and export (folders stay intact) - Route Planner lets you plan routes ahead of time by placing points on the map. You can also save and edit routes later. It shows the total distance and area of the route you draw. - Measure Tool for checking distance and angle between points: touch and hold the map with two fingers. Supports degrees, NATO mils (6400) and Finnish piiru (6000) - Display, copy, and search coordinates in WGS84 (DD, DDM, DMS), ETRS-TM35FIN, MGRS, UTM / ETRS89, SWEREF 99 TM, and ETRS-GK - Drop a base camp and navigate back to it whenever you need - Address and place search with recents and autocomplete - Apple street and satellite maps when you need a different view A small note on GPS: tracking in the background drains the battery faster than usual, so keep an eye on it on longer trips. Map data: © Kartverket
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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 Native
Expo
Supabase
react-navigation
@react-native-community/geolocation
@react-native-maps
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.
