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
Scales Pro - Chords & Scales
unveiling harmony: scales pro - the circle of fifths app
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
286 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.
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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's included17 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 Scales Pro - Chords & Scales: 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 the library of scales and chords with user-generated content.
Assumption to check: Limited scale and chord options compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Optimize audio playback for smoother performance.
Assumption to check: Audio playback can be laggy or inconsistent.
Validate with people who use this workflow before building.
Hypothesis 3
Introduce interactive practice modes and lessons for better learning.
Assumption to check: Lack of advanced features like practice mode or interactive lessons.
Validate with people who use this workflow before building.
Hypothesis 4
Simplify pricing structure and provide clear value for each tier.
Assumption to check: Subscription model 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
unveiling harmony: scales pro - the circle of fifths app master the musical landscape with our app, your interactive guide to key signatures, chords, and scales! explore with ease: visualize relationships: our interactive circle lets you explore the connections between major and minor keys, all at your fingertips. identify key signatures: learn how many sharps or flats belong to each key with a tap. discover chords: unlock the secrets of harmony by generating chords for any key instantly. practice scales: master the building blocks of music with on-screen scale diagrams for every key. this app is perfect for: music students: gain a deeper understanding of music theory in a fun and interactive way. musicians of all levels: enhance your composition skills and experiment with new harmonies. vocalists and instrumentalists: quickly identify key signatures and transpose sheet music on the go. dive into scales and chords with scales pro! this interactive app utilizes the circle of fifths to guide your learning. simply swipe the wheel to explore all 12 tones of the chromatic scale, and tap any note to hear it sound. scales pro offers clear visuals with color-coded fretboards (for 12 guitar scales) and keyboards (for 6 piano chords), making it an ideal tool for musicians of all levels. instruments: - acoustic guitar - bass guitar - piano scales: - major - natural minor - harmonic minor - minor pentatonic - major pentatonic - blues modes: - mixolydian - locrian - lydian - dorian - phrygian - aeolian chords for the piano: - major, dominant 7th, minor, major 7th, minor 7th
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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
Zustand
Supabase
react-navigation
expo-av
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.
