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
CoinIn: Coin Scan Identifier
Are you a coin collector looking to identify your latest find? Or maybe you stumbled upon a coin and want to know its value? Well, look no further! Introducing the new Coin Identifier - your one-stop-shop for all thin...
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
100,466 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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included17 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 CoinIn: Coin Scan Identifier: map the core Reference 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 a community feature for users to submit new coins.
Assumption to check: Limited coin database may frustrate users.
Validate with people who use this workflow before building.
Hypothesis 2
Optimize the scanning algorithm for faster results.
Assumption to check: Slow image recognition processing time.
Validate with people who use this workflow before building.
Hypothesis 3
Add a tutorial or onboarding process to guide new users.
Assumption to check: App can be confusing for first-time users.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce a more subtle way to showcase premium features.
Assumption to check: In-app purchase prompts can be intrusive.
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
Are you a coin collector looking to identify your latest find? Or maybe you stumbled upon a coin and want to know its value? Well, look no further! Introducing the new Coin Identifier - your one-stop-shop for all things coin-related. With just a snap of a picture, our app can identify your coin, provide detailed information about its history, estimate coin value, and even connect you with coin sellers and buyers. No more sifting through endless coin catalogs or scouring the internet for hours. Our app makes coin collecting easy, fun, and profitable. Key CoinIn features: Identify coins at lightning speed You won't have to spend hours searching through reference books or browsing the internet for visual confirmation. Accurately identify over 270,000 coins Our large database contains more than 270 000 coins and allows you to identify any kind of coin. CoinIn scanner takes into account the type of material, time of creation, and coin condition, to provide you with the most precise and reliable information. Recognize rare, foreign, and error coins Whether you're one of the seasoned coin collectors looking for a rare gem, or a newbie who’s just starting out, CoinIn has got you covered. Follow coin collection trends Stay up to date with the coin collection series and be the first to add new gold and metal coins to your collection. Create a personalized online collection Record, store, and access your collections right in the app anytime, anywhere. With CoinIn, you can turn your coin collection into a treasure trove - get started today! About CoinIn Subscription: - When you purchase CoinIn app subscription, the payment will be charged to your iTunes Account after confirmation. - The subscription will automatically renew, unless you turn off the auto-renew option at least 24 hours prior to the end of the current period. - The cost of renewal will be identified and charged to your account within 24 hours prior to the end of the current period. - If there is any unused portion of a free trial period offered, it will be forfeited upon purchasing a subscription to the publication. - You can manage your subscriptions and turn off auto-renewal by accessing your Account Settings after purchase. Ready to identify coins with ease? Get CoinIn today! Please note that terms and conditions, as well as our privacy policy, apply. Privacy Policy: https://legal.coininapp.com/privacy-policy.html Terms of Use: https://legal.coininapp.com/terms-of-service.html Contact us: [email protected]
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/native
expo-camera
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.
