App Overview

Canon: Chord Composer icon

Canon: Chord Composer

Dylan Shade · Music

Unlock endless minor, sad, guitar, jazz, piano & ukulele chord progressions

$4.99 · In-app purchases

PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.9
10 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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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 Canon: Chord Composer: 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 library with user-submitted chords

Assumption to check: Limited chord options compared to competitors

Validate with people who use this workflow before building.

Hypothesis 2

Simplified tutorials and onboarding process

Assumption to check: Interface can be overwhelming for beginners

Validate with people who use this workflow before building.

Hypothesis 3

Incorporate sharing options for compositions

Assumption to check: Lack of social sharing features

Validate with people who use this workflow before building.

Hypothesis 4

Enable offline editing and playback features

Assumption to check: No offline access for compositions

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

Unlock endless minor, sad, guitar, jazz, piano & ukulele chord progressions. Randomize. Customize. Compose. Canon is the ultimate random chord generator and progression composer for musicians, producers, and worship leaders. Whether you need minor chord progressions for emotional depth, sad chord progressions for melancholic moods, guitar chord progressions for acoustic pieces, piano chord progressions for classical arrangements, or jazz chord progressions for improvisation—Canon delivers instant inspiration powered by 1.5M real songs. CREATE YOUR WAY Canon adapts to your workflow with three distinct creation modes: - Instant Inspiration: Fully randomize any progression type (minor, sad, jazz, guitar, piano, ukulele) with a single click to find unique sounds you wouldn't normally play. - Intelligent Discovery: Use our smart Chord Decks to select chords that fit your mood and style perfectly. - Total Control: Manually build progressions chord-by-chord for precise composition. CORE FEATURES - Random Chord Generator: Tap "Reroll" for instant progression inspiration - Instrument-Specific Tools: Play your chords strummed to resemble guitar, and ukulele chord progressions - Realistic Playback: Hear your progressions come alive with authentic sounds - Studio-Ready MIDI Export: Drag progressions directly into Logic, Ableton, GarageBand, and more - Infinite Progressions: No length limits. Build loops or complete song structures - Master Every Key: Transpose any progression to suit your vocal range or instrument - Band Collaboration: Share progressions with bandmates during rehearsal WHY CANON? We believe technology should serve the artist. Canon is built to be invisible—powerful enough for complex theory, simple enough to focus on what matters: the song. Download Canon and discover your next progression today.

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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.

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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.