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 Viewer PRO: Hike & Bike
EXPLORE DEEPER
$6.99 · In-app purchases
PRICE
$6.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
209 ratings · Top 15%
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 included18 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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 Viewer PRO: Hike & Bike: 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 a robust offline mode with downloadable maps.
Assumption to check: Limited offline access and features
Validate with people who use this workflow before building.
Hypothesis 2
Enhance the routing algorithm for better accuracy.
Assumption to check: Navigational accuracy can be inconsistent
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the UI to improve user experience.
Assumption to check: Cluttered interface with too many options
Validate with people who use this workflow before building.
Hypothesis 4
Improve app stability and error handling.
Assumption to check: Frequent crashes on certain devices
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
EXPLORE DEEPER. NAVIGATE SMARTER. RELIVE EVERY ADVENTURE. Do you have GPX or KML tracks you love? Or are you ready to head into the mountains and record your next journey? GPX Viewer PRO transforms your iPhone and iPad into a powerful outdoor companion — whether you're hiking, biking, or exploring new terrain. From planning routes to analyzing every detail of your trip, everything you need is right in your pocket. BRING YOUR ROUTES TO LIFE Import your GPX and KML files in seconds and instantly visualize them on beautiful, detailed maps. • View multiple tracks, routes, and waypoints at once • Explore past adventures or discover new ones • Customize colors and styles to match your journey UNDERSTAND EVERY STEP YOU TAKE Go beyond just tracking — analyze and improve your performance. • Measure distance, speed, elevation, climbs, and more • Dive into detailed charts like elevation and speed profiles • Compare activities and track your progress over time • Support for advanced data like heart rate, cadence, and power NAVIGATE WITH CONFIDENCE Stay on course wherever you go. • Real-time GPS tracking with map rotation • Follow your position live on the map • See your current speed, pace, elevation and direction ONLINE & OFFLINE MAPS ANYWHERE No signal? No problem. • Access a wide range of maps (Apple Maps, OpenStreetMap, OpenTopoMap, and more) • Download detailed offline maps worldwide • Choose from multiple map styles for city or outdoor use • Enjoy regular map updates with improved data TRACK, RECORD & SAVE YOUR ADVENTURES Capture every moment of your journey. • Record tracks with speed and elevation data • Save routes and waypoints directly on your device • Export your data anytime in GPX or KML format WAYPOINTS MADE SIMPLE Mark important places and never lose track. • Add waypoints with a simple tap • Customize icons and colors • View detailed waypoint information PLAN ANYWHERE WITH TRACKBOOK Seamlessly sync with our free planning tool - https://trackbook.com • Plan routes on desktop • Sync tracks and waypoints instantly to your device DESIGNED FOR SIMPLICITY A clean, intuitive interface that just works. • Easy to use from the first launch • Supports both light and dark mode YOUR ULTIMATE OUTDOOR COMPANION Whether you're hiking remote trails, cycling long distances, or simply exploring your surroundings, GPX Viewer PRO helps you navigate, analyze, and relive every adventure.
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
react-navigation
axios
expo-location
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.
