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
Phone Tracker – GPS Finder
Stay Close, Stay in Control with Phone Tracker
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 2.6
25 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 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 Phone Tracker – GPS Finder: 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
Implement enhanced GPS algorithms for better precision.
Assumption to check: Limited accuracy in location tracking
Validate with people who use this workflow before building.
Hypothesis 2
Design a more user-friendly interface with clear navigation.
Assumption to check: Poor user interface and navigation flow
Validate with people who use this workflow before building.
Hypothesis 3
Make subscription tiers more visible and provide free trials.
Assumption to check: In-app purchases are not clearly presented
Validate with people who use this workflow before building.
Hypothesis 4
Focus on thorough testing and bug fixes before launch.
Assumption to check: Low app ratings due to bugs
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 Close, Stay in Control with Phone Tracker Discover the smarter way to keep track of your loved ones and devices. Phone Tracker is the all-in-one location app that helps families and friends stay connected, find each other instantly, and stay safe — every day. Main Features: Family Location Tracker Set up a private group and check live locations on a real-time map. Whether your kids are heading to school or your partner is running late, know where they are with a single glance. Live Location Sharing Forget the constant ""Where are you?"" texts. Share your location in real time and see your group’s movements as they happen — ideal for meetups or just peace of mind. Location History Log Review where your family or friends have been. Check visited spots and movement history to stay aware and keep everyone safe. Find Your Lost Device Lost your phone or tablet? Use GPS to locate it fast and get it back in seconds. Quick, reliable, and stress-free. Control Your Privacy Choose who can view your location and when. With flexible settings, you’re always in charge of your visibility. SOS Emergency Alerts Tap once to send a distress signal with your live location to selected contacts. Perfect for emergencies or unexpected situations. Battery Efficient Stay connected all day without draining your phone. Our technology is built to use minimal power. Easy-to-Use Design Clean maps, simple navigation, and no tech skills required. Anyone can use it — from kids to grandparents. Regular Updates We continuously improve performance and features based on user feedback to make your experience better with every version. Perfect for Everyday Life Whether you're a parent, partner, roommate, or traveler — Phone Tracker gives you peace of mind and smarter ways to connect. Stay connected. Stay protected. Stay informed. Privacy First We’re committed to protecting your privacy and data. Privacy Policy: https://telegra.ph/Privacy-Policy-05-21-71 Terms of Use: https://telegra.ph/Terms-of-Use-05-21-3 Download Phone Tracker now and enjoy a safer, smarter location experience.
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
react-native-maps
expo-location
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.
