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
Fingering & Tuning Charts
The most COMPLETE intonation resource for students, private music instructors, and band directors! Fingerings, alternate fingerings, and tuning suggestions are compiled from years of research from the best in the profession.
$19.99 · In-app purchases
PRICE
$19.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included14 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 Fingering & Tuning Charts: 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
Expand instrument library and add user-upload feature.
Assumption to check: Limited instrument selection compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Introduce a freemium model with limited access.
Assumption to check: High upfront cost with no trial
Validate with people who use this workflow before building.
Hypothesis 3
Add sharing functions for users to share favorite fingerings.
Assumption to check: No social features or community engagement
Validate with people who use this workflow before building.
Hypothesis 4
Integrate audio feedback for tuning guidance.
Assumption to check: Lack of audio features for tuning
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
The most COMPLETE intonation resource for students, private music instructors, and band directors! Fingerings, alternate fingerings, and tuning suggestions are compiled from years of research from the best in the profession. Fingering & Tuning Charts is an interactive, color-coded fingering chart for the full-range of wind instruments. Select one of ten instruments (flute, oboe, clarinet, saxophone, bassoon, trumpet, horn, trombone, euphonium, or tuba). Tap or scroll through notes on the staff to see its corresponding fingering as well as its inherent pitch tendency. In addition, each figure will display suggestions for alternative fingerings in order to play each note in equal tuning and/or adjust each note for just tuning. Black-color indicates regular fingerings; Green-color indicates suggested fingerings to add; and Red-color indicates suggested fingerings to delete. The app also identifies the best tuning notes for each instrument, and the information-button provides helpful tips on tuning each instrument in relation to dynamics, air speed and direction, and embouchure. A detailed Key Chart allows you to zoom in on particular fingerings and note names. Some notes will display up to four suggested alternate fingerings. You will find the options indicated in a menu on the right side of the fingering.
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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 Audio
React Native Reanimated
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.
