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
LocFaker - Change Current Location on the Map
It can mask your real current location by searching for a specific location or simply by LONG PRESS anywhere on the map.
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 1.2
16 ratings · Below Average
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 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 LocFaker - Change Current Location on the Map: map the core Utilities 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
Ensure robust error handling and thorough testing before launch.
Assumption to check: App has a low rating due to bugs and crashes.
Validate with people who use this workflow before building.
Hypothesis 2
Add advanced features like location history and sharing options.
Assumption to check: Limited functionality with only basic location features.
Validate with people who use this workflow before building.
Hypothesis 3
Provide clear information on what users get for each purchase.
Assumption to check: In-app purchases are not clearly explained.
Validate with people who use this workflow before building.
Hypothesis 4
Design a more intuitive interface with clear icons and labels.
Assumption to check: User interface is not user-friendly.
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
It can mask your real current location by searching for a specific location or simply by LONG PRESS anywhere on the map. After selecting the exact location (long press), you can share a screenshot of your fake location to trick your friends. The App can NOT display or change the user's real current location, the location on the map view is a fake one, just for fun. Declaration: The App has nothing to do with Pokemon GO, and can't change the real user's current location to anywhere else, just get a fake location on the map. * Feature - Long Tap on the Map to Set Fake Location - Tap on the Blue Dot and ">" button - Search Location - Show Location Coordinate (Latitude, Longitude) - Show Location Address : Street number and name - History Location List - Map : General / Satellite / Hybrid - Location History List * Send Data - Location Address - Location Card (VCard) - Map linked URL (Google Maps, Apple Maps) - PNG image (Screenshot) - TXT, CVS, KML files * Share Fake Location - Send to Twitter - Send to Facebook - Send to E-Mail - Send to Text Message(SMS) - Send to iMessage - Save to Photos
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
Zustand
@react-navigation/native
expo-location
react-native-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.
