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
Coin ID: Coin Value Identifier
Have you always dreamed about an app that would organize your coins for you? Or maybe you want to take up a new non-trivial hobby? Well, meet Coin ID—your guide into the fun world of numismatics!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
44,647 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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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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 included18 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 Coin ID: 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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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
Have you always dreamed about an app that would organize your coins for you? Or maybe you want to take up a new non-trivial hobby? Well, meet Coin ID—your guide into the fun world of numismatics! What is Coin ID? Coin Identifier This app works like magic: take two snaps of the obverse and reverse sides of the coin, and boom—our smart AI will find you a match in mere seconds! Coin Guide Learn everything about your coins: their size, composition, weight, year of minting, country of origin, designer, and even fun facts from their history! The app will also tell you the current reference price of each coin to help you understand its value. Who knows, maybe you’re sitting on a fortune? Coin Collection Keep your coins well-organized; add newly identified pieces to your collection to keep track of them at all times. You can create multiple collections to sort your coins in whatever order you like. If you don’t know where to start—try our Official Sets; from State & Territorial Quarters to Presidential Dollars, these sets will get you started and help to channel your inner treasure hunter to collect them all. Why Coin ID? Coin ID has the right tools to make any numismatist happy. It offers: ● Fast and accurate coin recognition ● Extensive information about coins from all over the globe ● Possibility to keep record of added coins ● Tracker of the overall number of coins in your collection ● Up-to-date reference prices ● Ability to create multiple collections of coins ● Interesting facts about coins ● Easy-to-use interface So, what are you waiting for? Discover a new hobby or dive deeper into the world of numismatics to become a coin expert. Coin ID will be at your side on this exciting journey! Subscribe to Coin ID Premium to get unlimited access to all the app’s features: • Subscriptions are billed weekly, monthly, or annually at the rate depending on the subscription plan. • Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. All personal data is protected in accordance with the Terms of Use and Privacy Policy: https://aiby.mobi/wtcoin/privacy/ https://aiby.mobi/wtcoin/terms/ For any questions or inquiries, please use our customer support form at https://aiby.mobi/wtcoin/support/
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
Provide extensive historical data and analytics for coins.
Assumption to check: Limited coin data and historical information available.
Validate with people who use this workflow before building.
Hypothesis 2
Implement faster scanning algorithms and provide instant feedback.
Assumption to check: Slow scanning process can lead to user frustration.
Validate with people who use this workflow before building.
Hypothesis 3
Clearer explanation of premium features and benefits.
Assumption to check: In-app purchases can be confusing or unclear.
Validate with people who use this workflow before building.
Hypothesis 4
Simplify UI and make key information more accessible.
Assumption to check: User interface can be cluttered with too much information.
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
React Navigation
axios
expo-camera
react-native-chart-kit
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.
