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
Ear training Pro: piano guitar
introducing the ultimate upgrade to our popular ear training music app - "ear training pro"! with an array of exciting new features, this app offers a fully immersive learning experience without any pesky ads.
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
18 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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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 Ear training Pro: piano guitar: map the core Music 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
Provide more detailed analytics and feedback after each exercise.
Assumption to check: Limited feedback on user progress and performance
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to share their progress and achievements with friends.
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Introduce new exercises and challenges regularly to keep users engaged.
Assumption to check: Exercises may become repetitive
Validate with people who use this workflow before building.
Hypothesis 4
Create clearer prompts and explanations for the in-app purchase options.
Assumption to check: In-app purchase confusion
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
introducing the ultimate upgrade to our popular ear training music app - "ear training pro"! with an array of exciting new features, this app offers a fully immersive learning experience without any pesky ads. take your musical abilities to the next level with our comprehensive training modules designed to develop your ear for various percussion instruments, including drums. whether you're a seasoned musician or just starting your musical journey, "ear training pro" is the perfect tool to enhance your musical abilities. but that's not all! "ear training pro" also helps you develop perfect pitch, and trains your ear to recognize notes and chords in any key. with a series of exercises tailored to improve your aural skills, you can learn at your own pace and gradually master all the notes and chords in the major and minor scales. each exercise is accompanied by a clear and concise explanation, so you can understand the theory behind it. and if you get stuck, our app includes a handy hint function to guide you through. you can even choose to practice in a particular key or with a particular instrument to make your learning experience even more personalized. so what are you waiting for? start training your ear today and become a master musician with "ear training pro"!
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
expo-av
react-navigation
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.
