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
4WD Maps - Offline Topo Maps
Best value Hema App
$64.99 · In-app purchases
PRICE
$64.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 2.2
4 ratings · Below Average
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 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 4WD Maps - Offline Topo 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
Implement rigorous testing and a feedback loop for continuous improvement.
Assumption to check: Poor user experience and low ratings due to app crashes and bugs
Validate with people who use this workflow before building.
Hypothesis 2
Offer extensive offline maps with customizable regions.
Assumption to check: Limited offline map features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 3
Introduce flexible pricing tiers and add value to encourage more users.
Assumption to check: Subscription pricing is high for casual users
Validate with people who use this workflow before building.
Hypothesis 4
Enhance search functionality with filters and improved algorithms.
Assumption to check: Difficulties in searching for locations and POIs
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
Best value Hema App. The one-time cost includes all Hema 4WD maps, without any recurring subscriptions. Use offline mapping and your device’s in-built GPS receiver to see where you are on detailed Hema maps, which feature roads, 4WD tracks, topographic information and POIs to guide your travels off the beaten track. NAVIGATE OFFLINE Find your location Real-time GPS tracking* Australia-wide map coverage Simple zooming PLOT YOUR TRIP Drop waypoints Plan routes Placename search SAVE & RECORD YOUR TRACKS Record your trips Create tracklogs Save tracks with information Share tracklogs & waypoints ACCESS HEMA'S PREMIUM MAP COLLECTION The app comes preloaded with a massive library of Hema touring and 4WD maps that covers all of Australia: Base Maps: Australia 1:250K TOPO Hema Explorer Map at 1:150,000 - 1:10M Goldfields-Esperance - Cape Arid NP Goldfields-Esperance - Cape Le Grand NP Cape York - The CREB Track Cape York - Lakefield NP Cape York - The Tip Goldfields-Esperance - Fitzgerald River NP Flinders - Flinders Ranges Mainmap Flinders - Mount Remarkable NP Flinders - Flinders Ranges NP Flinders - Vulkathunha Gammon Ranges NP Fraser Island - Central Station Fraser Island - Mid Fraser Fraser Island - Rainbow Beach Great Desert Tracks - North Central Great Desert Tracks - North East Great Desert Tracks - North West Great Desert Tracks - South Central Great Desert Tracks - South East Great Desert Tracks - South West Goldfields-Esperance and Southern Coast of WA Goldfields-Esperance Region High Country Victoria East High Country Victoria West Top End - Kakadu National Park Outback NSW - Kinchega NP Sth West Corner - Margaret River Wine Region Mid West Western Australia Mid West WA - Francois Peron NP Mid West WA - Kalbarri NP Mid West WA - Kennedy Range NP Mid West WA - Mount Augustus NP Outback NSW - Mungo NP Outback NSW - Mutawintji NP Outback New South Wales Outback Queensland Outback QLD - Bladensburg NP Outback QLD - Carnarvon Gorge Outback QLD - Currawinya NP Outback QLD - Diamantina NP Outback QLD - Idalia NP Outback QLD - Mt Moffat Outback QLD - Salvator Rosa and Ka Ka Mundi Pilbara Pilbara - Cape Range NP Pilbara - Karijini NP Pilbara - Millstream Chichester NP Pilbara - Rudall River Karlamilyi NP Simpson Desert 1:1,100,000 Simpson Desert 1:500,00 South West Corner - 200k South West Western Australia Goldfields-Esperance - Stirling Ranges NP Goldfields-Esperance - Stokes NP Outback NSW - Sturt NP The Kimberley The Kimberley - Dampier Peninsula The Kimberley - Purnululu NP The Kimberley - Wyndham-Kununurra The Red Centre Top End and Gulf - Boodjamulla NP Top End and Gulf - Darwin Region Top End and Gulf - Gregory NP Top End and Gulf - Keep River NP Top End and Gulf - Nhulunbuy DOWNLOAD ADDITIONAL MAP SOURCES Access a wide range of additional map sources which are available for purchase via the Memory-Map Digital Map Shop. USE ON WINDOWS PC or MAC Use the same maps and overlays on your desktop/laptop to plan your route and review tracklogs. (Maps sold separately). *You do not need a SIM Card installed or cellular coverage to utilise the GPS tracking functions on iPad for the app, though a WiFi+Cellular iPad is necessary to discover and track your location. A WiFi-only iPad does not contain the in-built GPS that a WiFi+Cellular iPad does, however external Bluetooth GPS receivers can be purchased for use with a WiFi-only iPad.
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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.
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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.
