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
Amazing Coin (USD) Dollar
No.1 Coin Learning Games for Kids! 270,000+ Educational Purchased by Schools around the U.S.!
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.4
80 ratings · Top 30%
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
Make this idea yours
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 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 Amazing Coin (USD) Dollar: map the core Education 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
Incorporate more engaging interactive quizzes and videos.
Assumption to check: Limited interactive content in educational apps
Validate with people who use this workflow before building.
Hypothesis 2
Implement a more visual and gamified progress tracking system.
Assumption to check: Difficulty in tracking progress effectively
Validate with people who use this workflow before building.
Hypothesis 3
Provide clearer descriptions and benefits of paid features.
Assumption to check: In-app purchases can be unclear
Validate with people who use this workflow before building.
Hypothesis 4
Introduce forums or chat features for users to discuss lessons.
Assumption to check: Lack of community features
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
No.1 Coin Learning Games for Kids! 270,000+ Educational Purchased by Schools around the U.S.! 2. 9 interactive games about USD coins learning, counting, paying, making change, matching and etc. 3. A quarter rewards for each correct answer, with the rewards kids can buy food in the store, and eat them later. 4. Uninterrupted and unlimited play: game continues as long as the player desires. "My son is learning so fast how to buy, pay and receive exact change. Gives him idea of spending in what he really needs within a budget."--Lucy Daniel S "Great app! It covers a wide range of first grade math skills."--Tech edj "I do like the integration of half dollar and dollar coins because my daughter is learning those coins as well in Kindergarden at the school she attends."--Girly@18 Amazing Coin is a fun and educational game for kids to practice identifying and solving math problems with coins. It will teach your kids how to recognize, count, add, pay and make change with coins. Include 9 Games: 1. PAY FOR ITEMS: You want to buy a food, how much coins should you pay? Please drag the exact amount of money into the box. 2. MAKE CHANGE: You want to buy a food and you have paid some coins, how much money will you get back in change. 3. FIND THE SAME VALUE There are 2-5 coins, can you find how much there is in all? 4.WORDS: Learn the name and spelling of different coins. 5. MATCHING: Match pairs of coins with the correct value. 6. ADD IT UP: There is an equation; Please fill in how much there is in all with the coins provided. 7. GREATEST VALUE/ LEAST VALUE: Which coin has the greatest value? Which coin has the least value? Figure it out by popping the correct bubble. 8. SEQUENCES: There is a group of coins in the right order, but some are missing, please complete the sequence with the coins provided. 9. PATTERNS: There is a pattern, but one coin is missing, please complete the pattern with the coins provided. 4 most frequently used coins PENNY, NICKEL, DIME, QUARTER will be showed and played by the default setting, and you can turn on two coins as HALF DOLLAR and DOLLAR to teach kids about 50 cents and 100 cents in Setting button. At same time, you can customize the 9 games and obverse/reverse coins by Setting button. Amazing Coin is designed to be kid-friendly! There are no complicated menus for kids to get confused by, or multiple options to get lost in. kids presses one button to immediately launch into uninterrupted play. Now, let us play it! Fun! Fun! Fun! Contact Us: Email:[email protected] Like:facebook.com/JoyPreschoolGame Follow:twitter.com/JoyPreschool
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-video
BUILD KIT DIFFICULTY
Starter
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.
