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
HW Tracker – Price & Inventory
HW Tracker puts 5,000 Hot Wheels and 30,000+ store locations at your fingertips — with real-time pricing and inventory reports from a community of collectors just like you.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 3.3
71 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 included18 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 HW Tracker – Price & Inventory: map the core Shopping 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
Expand product range and categories to attract more users.
Assumption to check: Limited product variety and categories
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate user reviews to build trust and improve product selection.
Assumption to check: Lack of user reviews and ratings
Validate with people who use this workflow before building.
Hypothesis 3
Add push notifications to keep users engaged with real-time updates.
Assumption to check: No push notifications for deals or wishlist updates
Validate with people who use this workflow before building.
Hypothesis 4
Simplify in-app purchase options and provide clear information on benefits.
Assumption to check: In-app purchases are confusing
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
HW Tracker puts 5,000 Hot Wheels and 30,000+ store locations at your fingertips — with real-time pricing and inventory reports from a community of collectors just like you. SCANNER Scan any HW model car to add it to your collection COLLECTION Add cars to your collection from our catalog of over 5,000 cars REAL TIME PRICING Users collections refresh daily REAL-TIME STORE REPORTS See the latest inventory status at Walmart, Target, Dollar Tree, Dollar General , and more. Fellow hunters share photo reports so you always know what's fresh. STORE MAP Find every Hot Wheels retailer near you. Filter by store type, see restock history, and plan the perfect hunting route. EARN REWARDS & COMPETE Check in at stores, upload photos, and earn points. Climb the leaderboard, unlock achievements, and level up your collector rank. RARE FIND ALERTS Super Treasure Hunts, Chase cars, ZAMACs — when someone spots one, you'll know. Never miss a rare find again. RESTOCK PREDICTIONS Our system tracks restock patterns so you can hit stores at the right time, not the wrong one. PHOTO GALLERY & TREASURES Document your finds, build your collection gallery, and show off your best pulls. Join thousands of collectors who hunt smarter. Download HW Tracker and find faster. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://hotwheels-spotter-app.lovable.app/privacy
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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
Supabase
react-native-reanimated
expo-router
react-query
BUILD KIT DIFFICULTY
Expert
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.
