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
LocFam : Family Locator
Stay connected with your family, wherever they are.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 2.5
894 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's included20 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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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 LocFam : Family Locator: 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
Implement more precise geolocation services
Assumption to check: Limited accuracy in location tracking
Validate with people who use this workflow before building.
Hypothesis 2
Focus on a modern, user-friendly aesthetic
Assumption to check: Poor user interface design
Validate with people who use this workflow before building.
Hypothesis 3
Optimize data handling and loading times
Assumption to check: Low performance with multiple users
Validate with people who use this workflow before building.
Hypothesis 4
Increase transparency and control over location data sharing
Assumption to check: Privacy concerns with location sharing
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
Stay connected with your family, wherever they are. Whether your child is commuting to school, your family is traveling, or you simply want extra peace of mind, this GPS-powered family location app helps you stay informed in real time. Real-Time Family Location Create a private family circle and invite members with a secure 6-digit code. Once they join and grant permission, you can view their real-time location on a dedicated private map. Place Alerts Add important places such as home, school, or work for selected family members. When they arrive at or leave a saved place, you can receive timely notifications. Emergency SOS In an emergency, one tap sends an instant SOS alert to circle members, including the sender’s updated real-time location. Location History View members’ location history to better understand daily routes, check past movements, or help find a lost device. Privacy First All members must install the app voluntarily and grant location permission before sharing begins. Location services require prior consent from the person being located. Privacy Policy: https://www.ltinhlab.com/policy/locfam/privacy_policy.html Terms of Use: https://www.ltinhlab.com/policy/locfam/terms_of_use.html
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
Firebase
Mapbox
Redux
React Navigation
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.
