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-Gpx Converter app
Gpx Viewer-Gpx Converter(Two in one) is an application provides you to load the gpx files, convert gpx files over the map.
$2.99 · In-app purchases
PRICE
$2.99
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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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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Gpx Viewer-Gpx Converter app: 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
Add support for more formats like KML and CSV.
Assumption to check: Limited file formats for conversion
Validate with people who use this workflow before building.
Hypothesis 2
Implement offline maps and GPX file access.
Assumption to check: No offline functionality
Validate with people who use this workflow before building.
Hypothesis 3
Add progress indicators and notifications for conversions.
Assumption to check: Lack of user feedback on conversion process
Validate with people who use this workflow before building.
Hypothesis 4
Enhance the map display with features like elevation profiles.
Assumption to check: No way to visualize GPX data effectively
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
Gpx Viewer-Gpx Converter(Two in one) is an application provides you to load the gpx files, convert gpx files over the map. This app works for offline and online. 1)How to Export and Import .gpx files into Application? You can view, add or import .gpx files into the application in multiple ways —>Keep the .gpx files to the mail, then long press on gpx file from mail that shows the application icon.click to import the file over the map. —>Add files from other apps which will be similarly supported files like Email,WhatsApp,Add to Notes,Add to iCloud Drive,Save to files and other apps. —>Click on “Add through link” Icon on Menu bar enter .gpx files link to add the files in to the application. —>Connect your iPhone or iPad to System then iTunes will automatically opens an window.Click phone symbol on top left—>Apps.File Sharing and you can see the GPX Viewer app then click on app icon to add .gpx files. —>Tap on the file in Document folder to Share or export the gpx files to another application —>Easily Export Gpx files to Another application —>Easily Import Gpx files from Another application 2)How to create Gpx Waypoints? —>Long press on map to add waypoints or markers. —>You can Save the Gpx Waypoints with userDefined Names. —>After successfully saving the file will be stored in list. —>You can again load the saved Gpx file over the map. —>You can send the Gpx file through mail. 3)How to get Waypoints Details? —>Tap on waypoint then click on info icon, if waypoint contains Description,email id,url links,phone numbers etc, will be displayed on the description page. —>from description page you can open url links in another browser. 4)How to delete the Gpx file? —>In the list section, swipe left to delete file.The file will be permanently deleted from the application. Note: 1)This app contains Rich UserInterface and less navigational functionality. 2)some users doesn’t like Gps device tracking and navigation on map as this app made for them. 3)This app contains less labels on map, and more on Menu bar.This helps user easy interaction on Map. "Continued use of GPS running in the background can dramatically decrease battery life."
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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
react-navigation
expo-file-system
@react-native-async-storage/async-storage
expo-maps
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.
