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
CoinOn - coin value identifier
Discover the easiest way to identify and value any coin with our app! Just snap a photo to instantly get detailed information about coins from around the world—covering rare, ancient, error, and modern coins
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.6
1,067 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/
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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 CoinOn - coin value 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
Enhance with user-generated content and community contributions.
Assumption to check: Limited coin database
Validate with people who use this workflow before building.
Hypothesis 2
Integrate real-time market data for more accurate valuations.
Assumption to check: Inaccurate value estimations
Validate with people who use this workflow before building.
Hypothesis 3
Provide guides/tutorials to educate users on coin collecting.
Assumption to check: Lack of educational resources
Validate with people who use this workflow before building.
Hypothesis 4
Allow sharing across more platforms and formats.
Assumption to check: Limited sharing options
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
Discover the easiest way to identify and value any coin with our app! Just snap a photo to instantly get detailed information about coins from around the world—covering rare, ancient, error, and modern coins. Access a massive database of over 270,000 coins and receive accurate identifications in seconds. Track real-time market prices, get expert coin analysis, and manage your personal coin collection all in one place. Whether you’re a collector, investor, or just curious, our advanced AI-powered scanner and grading tools help you unlock the true value of your coins. Connect with fellow enthusiasts, buy and sell coins securely, and always stay ahead of numismatic trends. Make coin collecting easy, fun, and rewarding—anytime, anywhere. Please note that terms and conditions, as well as our privacy policy, apply. Privacy Policy: https://legal.coinonapp.com/privacy-policy.html Terms of Use: https://legal.coinonapp.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
@react-navigation/native
expo-camera
@supabase/supabase-js
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.
