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
VIN PRO Check Used Car History
VIN PRO – Everything You Need to Know About Any Car
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
79 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.
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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 VIN PRO Check Used Car History: 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
Provide more detailed reports with better data sources.
Assumption to check: Limited information on vehicle history may lead to user dissatisfaction.
Validate with people who use this workflow before building.
Hypothesis 2
Optimize API requests and implement caching.
Assumption to check: Inconsistent performance in loading results.
Validate with people who use this workflow before building.
Hypothesis 3
Add user profiles with customization options.
Assumption to check: Lack of personalization features for saved searches.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce tiered pricing with more affordable options.
Assumption to check: High pricing for detailed reports may deter purchases.
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
VIN PRO – Everything You Need to Know About Any Car Shopping for a used car? Selling one? Just want to know the real story behind a vehicle? VIN PRO is the easiest way to check VIN numbers, view history reports, track auctions, and explore trusted car listings — all in one app. — Now with VINPRO AI Introducing our brand-new AI Assistant: Ask questions about any car’s specs, history, known issues, or market value — and get smart, clear answers in seconds. Powered by real data, delivered with real insight. — Trusted Reports from Carfax and Autocheck Scan or enter a VIN and get full reports on: · Accidents · Mileage and title status · Ownership and service history · Recalls · And more · Live Auction Access · Follow real-time listings from Copart, IAAI, and more. · Monitor bids, price trends, and availability with powerful search and tracking tools. — Search Used Cars with Confidence Browse listings from top sources like Carfax, Autotrader, Carvana, and Carmax. Easily compare options, view histories, and connect with trusted sellers. — Built for Buyers and Dealers VIN PRO is built for everyday drivers, professional buyers, and dealerships. Use advanced tools like: · VIN scanner & decoder · Vehicle reports · AI-based car summaries · Window sticker support · Inventory management tools for dealers — Make Smarter Decisions With VIN PRO, you get the full picture before you buy — no surprises, no guesswork. Compare listings, decode any VIN, and instantly check a vehicle’s background. VIN PRO — Know what you’re buying. Know what you’re selling. Know the truth. Download now and check your car before you buy. ————————— Terms of Use: https://bit.ly/46ih2Ak Privacy Policy: http://bit.ly/3Wac57R
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
Supabase
Zustand
React Navigation
react-native-reanimated
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.
