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
Note Trainer Pro
Note Trainer is designed to help train your ability to read music
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
917 ratings · Top 5%
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 included16 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 Note Trainer Pro: 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
Incorporate a wider range of lessons and exercises.
Assumption to check: Limited lesson variety leads to user boredom
Validate with people who use this workflow before building.
Hypothesis 2
Implement a progress tracking system with detailed analytics.
Assumption to check: No user progress tracking
Validate with people who use this workflow before building.
Hypothesis 3
Provide clear descriptions and benefits for each purchase option.
Assumption to check: In-app purchases can be confusing
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
Note Trainer is designed to help train your ability to read music. It is aimed at beginners, music students, musicians and anyone interested in musical reading. Note Trainer includes exercises reading musical notes and musical chords. Exercise levels range from beginner to advanced. Note Trainer will guide you and recommend exercises to help you gradually improve your skills. More advanced users can focus on different areas of the application or select to start training at a higher level. When an exercise is complete the users' statistics are saved allowing them to track their progress and easily return to areas that need more training. Note Trainer indicates when a user is ready to move on to the next exercise. Features: - Preset exercises for notes and chords - Custom exercises for notes and chords - Note Trainer supports English (B, Bb), German (H, B), and Solfége (Do, Re, Mi) notation - Supports transposing instruments - Includes Treble, Bass, Alto and Tenor clefs - Answer using MIDI device (*), virtual piano or answer buttons - Answer by singing or playing an instrument (iPhone 5s and newer) - Visual feedback on virtual piano and note view - Statistics - Time challenge mode - Studio sound quality *) Using a MIDI-input device may require an Apple USB Camera Connection Kit
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
react-navigation
axios
expo-av
react-query
BUILD KIT DIFFICULTY
Intermediate
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.
