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
Cartograph 2 Maps
The Cartograph app views Mapsforge offline vector maps, offline raster maps, and online/WMS maps
$5.99
PRICE
$5.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.8
6 ratings · Top 50%
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 Cartograph 2 Maps: 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
Provide a more robust offline map feature with customizable downloads.
Assumption to check: Limited offline map functionality
Validate with people who use this workflow before building.
Hypothesis 2
Integrate real-time traffic data to enhance navigation.
Assumption to check: Lack of real-time traffic updates
Validate with people who use this workflow before building.
Hypothesis 3
Implement voice-guided navigation to assist users while driving.
Assumption to check: No voice navigation option
Validate with people who use this workflow before building.
Hypothesis 4
Simplify the UI with clearer icons and labels for better usability.
Assumption to check: User interface can be confusing
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
The Cartograph app views Mapsforge offline vector maps, offline raster maps, and online/WMS maps. It supports tracking, route search, overlays, hillshading, reliefs, track drawing, and has many other features. Cartograph Maps 3 is available here: https://www.cartograph.eu/v3/ ### Features ### - User interface languages: Dutch, English, French, German, Italian, Russian, Spanish, Traditional Chinese. - View Mapsforge offline vector maps (including v5 format). - Full support for Mapsforge styling/render themes (including hillshading) and layers. - Offline raster maps: Locus SQLite maps, MBTiles, TwoWays/CompeGPS RMAP*, Oruxmaps SQLite*. - Online map support (including WMS - Web Map Service maps), e.g. OpenStreetMap, OpenCycleMap, OpenSeaMap, WikiMedia hillshading, etc. - Import online maps easily from files: "http://www.cartograph.eu/help_onlinemapimport". - Offline hillshading (from HGT elevation data). - Offline relief shading. - Offline slope maps (experimental). - Contour lines (Mapsforge maps). - Worldwide, free offline maps. - Support for Mapsforge multi-maps (multiple .map files stitched into a single map). - Night/day mode. - GPS Track recording. - Manual track drawing and editing. - GPX import and export (basic KML/KMZ import support). - Import of photos with EXIF tags as waypoints. - Import of KMZ photo series. - Import Google Maps POIs/Places using Google Takeout data export function. - Upload tracks to Strava.com. - Route altitude profile and elevation/slope visualization. - Online route search. - Live tracking and polling (using custom server, GPSies.com, or Cartograph server). - Support for Mapsforge POIs, offline POI search, and dynamic POI loading. - Scalable interface (e.g. to increase button sizes). - Compass. - Units: Celsius, Kelvin, Fahrenheit, metric, imperial, nautic. - Decimal and degree coordinate modes. - Supports Mapsforge multi-language maps and POIs. - Map import: iOS 11 File Browser, Wifi upload, iTunes file sharing, internal download manager, and import using "Open in" from 3rd party apps like Safari, Chrome, DropBox, etc. - Voice/sound alerts along routes and waypoints. *EXPERIMENTAL* - WaterSupply.at drinking water sources. - Customizable user interface color (dark, light, and colors) and size. - 3D map snapshot view for an overview over the current map region. * RMAP and Oruxmaps use various map projections and support is experimental. Please contact us if a map does not work so that we can add support for your projection. Further information: http://www.cartograph.eu Getting started: https://www.cartograph.eu/gettingstarted Help&Tutorial: https://www.cartograph.eu/docs Facebook: https://www.facebook.com/Cartograph.eu/ User manual: http://www.cartograph.eu/downloads/usermanual_en.pdf YouTube how-to videos: https://www.youtube.com/watch?v=dn9EOg5h3yY&list=PLP8X6xYv-qCz46hplsfGLW1LNgywBZrTk Please drop us a line if you have questions or feature requests: http://www.cartograph.eu/contact ### Maps ### - Offline Map Downloader (https://www.tequnique.com/offlinemapdownloader) - OpenAndroMaps.org: very good maps for outdoor activities.
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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 Navigation
React Native Maps
Axios
@react-native-async-storage/async-storage
Expo
BUILD KIT DIFFICULTY
Intermediate
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.
