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
Tactical Gps. Offline Map
GPS Location Info shows your current location, date & time to the second along with a scrollable offline and online map
$5.99 · In-app purchases
PRICE
$5.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 ratings · Top 5%
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.
Build your own version
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/
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 Tactical Gps. Offline Map: 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 a feature for users to contribute updates to maps.
Assumption to check: Offline maps may not be comprehensive or updated regularly.
Validate with people who use this workflow before building.
Hypothesis 2
Enhance with user-generated content and ratings system.
Assumption to check: Limited user reviews and information on places.
Validate with people who use this workflow before building.
Hypothesis 3
Implement community-based map corrections.
Assumption to check: Navigation may not be accurate in rural areas.
Validate with people who use this workflow before building.
Hypothesis 4
Offer a free trial for premium features to increase conversion rates.
Assumption to check: Paywall may deter users from accessing premium features.
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
GPS Location Info shows your current location, date & time to the second along with a scrollable offline and online map. You can copy your coordinates & locate anything you can find on the map with accurate crosshairs. Have a telescope that needs your coordinates & the current time? Need to know the coordinates for your hunting stand? Going on a trek and need to find your lat/long? Want to scroll around the world and see where your favorite landmarks are? GPS Location Info is what you need. After launch, the map automatically centers on your location. Elevation is shown feet & meters. Your phone's time is shown in Greenwich Mean Time (aka Zulu time). To recenter the map on your location, just hit the crosshairs button. Drop Pins and save there where you want for quick access. *Coordinates of the map's center are shown in next formats: - Dec Degs (DD.dddddd°) - Dec Degs Micro (DD.dddddd "N, S, E, W") - Dec Mins (DDMM.mmmm) - Deg Min Secs (DD°MM'SS.sss") - Dec Mins Secs (DDMMSS.sss") - UTM (Universal Transverse Mercator) - MGRS (Military Grid Reference System)
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
@react-native-community/geolocation
react-native-maps
Zustand
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.
