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
Copper: Play, Shop, Earn Cash
Copper pays you real money for things you already do
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
96,860 ratings · Top 15%
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 Copper: Play, Shop, Earn Cash: map the core Lifestyle workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Copper pays you real money for things you already do. Scan a receipt. Play a game. Cash out to PayPal, Venmo, or a gift card. Get $10 when you join. Cash out once your balance reaches $25. HOW COPPER WORKS 1. Scan any receipt to earn 2. Play games and complete offers to earn more 3. Cash out real money at $25 CASH, NOT JUST CREDIT Earn real money you can send straight to PayPal or Venmo. Prefer a gift card? Choose from hundreds. Your money, your way. EVERY RECEIPT PAYS Groceries, gas, takeout, pharmacy, hardware. Scan a receipt from any store in America and earn. Every store, every receipt, every time. You already bought it. Now get paid for it. PLAY GAMES. EARN MONEY. Hundreds of free games to choose from, with new ones every week. Bingo, puzzles, word games, casual favorites. Play the games you like and earn while you do it. MORE WAYS TO EARN Take quick surveys. Try featured offers from brands you know. Refer a friend and you both get paid. The more you do, the faster you cash out. CASH OUT YOUR WAY PayPal. Venmo. Amazon, Starbucks, Target, Walmart and hundreds more gift cards. Once you hit $25, the money is yours to take out. NO CATCH. WE MEAN IT. Copper is free. We never ask for your credit card or bank details. The $10 welcome bonus is in your account the moment you sign up, and it counts toward your $25 cash out, so you only need to earn $15 more to get paid. PAID OUT AND COUNTING Over $20 million paid to users since 2024. Real money, to real people, every day. YOUR $10 IS WAITING Download Copper, get $10 to start, and cash out at $25. Total paid to users since 2024. Figure as of September 2026. Earnings vary and depend on games played, offers completed, and time spent.
Written user reviews are not shown here. Check current App Store reviews >
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 clearer reward tracking and notifications.
Assumption to check: Users often find it hard to track their rewards effectively.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to set personalized saving milestones.
Assumption to check: Limited customization for savings goals.
Validate with people who use this workflow before building.
Hypothesis 3
Optimize loading times and data management.
Assumption to check: App can be slow with large transaction history.
Validate with people who use this workflow before building.
Hypothesis 4
Simplify the subscription purchasing flow.
Assumption to check: In-app purchase process can be confusing.
Validate with people who use this workflow before building.
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.
