App Overview

Tonality: Music Theory icon

Tonality: Music Theory

Bryce Hostetler · Music

"Best music app tool I own, period!"

$7.99 · In-app purchases

PRICE
$7.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.8
129 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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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.

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.

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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Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Tonality: Music Theory: 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 more interactive quizzes and instant feedback.

Assumption to check: Limited interactivity in lessons

Validate with people who use this workflow before building.

Hypothesis 2

Introduce gamification and rewards for completed exercises.

Assumption to check: Monotony in exercises

Validate with people who use this workflow before building.

Hypothesis 3

Simplify navigation with clearer labels and better organization.

Assumption to check: Navigation difficulties

Validate with people who use this workflow before building.

Hypothesis 4

Provide clearer explanations of features behind paywalls.

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

"Best music app tool I own, period!" "Never downloaded an app so fast in my life" "Excellent app for music theory. It is brilliantly supported by the developer who is continually updating it... The app is indispensable for the reference and learning of music theory." Tonality is the ultimate chord, scale, and general music reference tool for musicians of all skill levels. It allows you to explore a large database of chords and scales and comes with tons of MIDI/AUv3 functionality, including chord pads for composition and performance. NOTE: Tonality will always be a one-time purchase with free upgrades. All IAPs are for tips only. CHORDS: • Chord dictionary with over 1,000 chords for piano and guitar • Listen to a chord by tapping, or arpeggiate by swiping • Reverse search for chords using piano or fretboard • Identify chords from the microphone using a cutting-edge ML algorithm • Search for chords by root, quality, and/or extension • View different inversions and omittable notes • View related scales GUITAR CHORD CHARTS: • View charts for any chord • Supports multiple tunings and instruments (including custom tunings) • Generate voicings by criteria including fret range, number of fingers used, and finger stretch • Left-handed option SCALES: • Scale dictionary with over 1,000 scales • Search for scales by root and name, and filter by various tags • Reverse search for scales using piano or fretboard • View scale degrees and note names • View ascending and descending versions • View all modes and scale chords CIRCLE OF FIFTHS: • Interactive circle of fifths: view key signatures and scales for major and minor keys • Focus on diatonic chords in a given key and view Roman numeral analysis EAR TRAINING: • Learn to recognize notes, melodies, intervals, chords, and scales by ear! • After each session, view what gave you trouble and create a level with just those items • View detailed statistics about each training session and your training history MUSICAL TERMS DICTIONARY: • View musical terms and their definitions/illustrations • Tempo, symbol, articulation, dynamics, and more MUSICAL TYPING KEYBOARD: • Special keyboard for typing and previewing chord symbols • Works wherever iOS keyboard does - enable it from Settings->General->Keyboard->Keyboards->Add New Keyboard... ---- Includes 4 AUv3 MIDI Plugins! ---- CHORD/SCALE IDENTIFICATION: • View the names of the piano chords/scales you play in real time • Record identified chords and export as text/MIDI CHORD PADS: • Add chords via list, scale chords, fretboard, name, or MIDI input • Drag and drop to and from other apps or plugin instances • Full voicing control: edit individual notes' octaves and velocities • Grid sizes from 2x2 to 12x12 • Strum bar for performing arpeggios or individual notes • MIDI trigger mappable with MIDI learn capability • Automation parameters for footpedal control • CC mapping on XY axes • Multiple velocity sensitivity modes • Custom presets can be saved and shared across hosts • Patchstorage integration for community sharing • Export pad sets as MIDI/XML files • Import Scaler chord packs (XML) GRAND STAFF: • View MIDI input in a grand staff in real time • Detects chord names CIRCLE OF FIFTHS: • Control other apps with a circle-of-fifths layout • Modify inversion, octave, extensions, and bass notes on the fly • Auto-voice lead option CUSTOMIZATION/ADVANCED: • Create your own chords, scales, fingerings, ear training levels, and definitions • Show set theory information for any pitch class set, including Forte numbers, pitch constellations, and Tonnetze • Choose the playback instrument (load any .sf2 file) • Choose note naming (English or Solfège)

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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
React Navigation
React Native Reanimated
AsyncStorage
BUILD KIT DIFFICULTY
Advanced

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.