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
GPX navigate with Google Maps
GPXMaps is the GPS navigation app for your own routes
$3.99
PRICE
$3.99
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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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included15 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 GPX navigate with Google 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
Efficient offline maps with small download size
Assumption to check: Uses too much data
Validate with people who use this workflow before building.
Hypothesis 2
Clear lane guidance and landmark references
Assumption to check: Voice directions unclear
Validate with people who use this workflow before building.
Hypothesis 3
Instant rerouting with traffic updates
Assumption to check: Slow route recalculation
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
GPXMaps is the GPS navigation app for your own routes. Import and export GPX files, record new routes, and follow them with voice guidance. No subscription, no required account, just works. First GPX app which works with NATIVE Google Maps embedded! Used for hiking, walking, cycling, car enduro's etc etc. FEATURES - Import GPX and KML files via file or URL - Record your own routes with GPS - Three navigation modes: exact GPX, Google Directions, or simulation - Voice guidance in 4 languages (Dutch, English, German, French) - Standard, satellite and hybrid map view - Auto-zoom on upcoming turns - Map rotates with heading (heading-up) - No account required - Privacy-friendly: routes stay on your device GPX FILES GPXMaps works with GPX and KML standard files. Import routes from Strava, Komoot, AllTrails, RouteYou, or any GPX source. Paste a direct link to a .gpx or .kml file to import it instantly. NAVIGATION MODES Exact GPX - navigate precisely over your recorded track with auto-calculated voice instructions. Google Directions - use Google routes with street names ("Turn right on Main Street"). Simulation - play the route virtually to check voice instructions before driving. RECORD Tap record and GPXMaps captures your route with GPS points, elevation and time. Pause and resume as often as you like. Save with a name and type (driving, cycling, walking). SETTINGS Customize everything: language, map type, voice speed, units (kilometers or miles), heading-up, auto-zoom. INTERNET An active internet connection is required for map display and Google Directions. GPS tracking and voice instructions also work without internet. PRIVACY GPXMaps collects no data. All routes stay on your device. Location is only used for live navigation and recording. https://www.verleijservices.nl/eula
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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
Mapbox
Expo Location
RevenueCat
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.
