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
Offline GPS Tracker & Compass
Offline GPS Tracker & Compass
$17.99 · In-app purchases
PRICE
$17.99
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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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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 Offline GPS Tracker & Compass: 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 more robust offline mapping features and caching.
Assumption to check: Limited offline functionalities in similar apps
Validate with people who use this workflow before building.
Hypothesis 2
Improve location accuracy algorithms.
Assumption to check: Inaccurate GPS tracking in dense areas
Validate with people who use this workflow before building.
Hypothesis 3
Create user-friendly navigation with clear indicators.
Assumption to check: Lack of intuitive navigation controls
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to categorize and tag saved locations.
Assumption to check: Limited customization for saved locations
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
Offline GPS Tracker & Compass Reliable offline navigation, route recording, and elevation tracking — with no account and no subscription. Offline GPS Tracker & Compass is designed for people who go beyond coverage. Record routes with live stats, download maps for offline use, save important locations, and replay your journeys anytime. Whether you hike, cycle, run, or travel off-grid, your data stays available on your device. What you can do Record and replay routes fully offline Download maps before you go Navigate directly to saved locations Track elevation with an interactive graph View route stats for distance, duration, speed, and elevation Use on-device motion detection and manual segment labeling Access weather forecasts and emergency tools for saved locations See route status on your Lock Screen with Live Activity Supported motion modes Auto and Manual Route Recording: Walk, Run, Cycling, Car, Motorcycle, Snow, Ski, Snowboard, Air, Plane, Skydive, BASE Jump Currently only Manual: Water, Cruise, Kayak, Rafting, Surfing, JetSki Private. Offline. One-time purchase.
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
expo-location
zustand
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.
