App Overview

The Chord Detector icon

The Chord Detector

Simon Hopkin · Music

Chord Detector is an app that will analyse audio sources and automatically detect the musical chords within it.

$1.99 · In-app purchases

PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
2.1
21 ratings · Below Average

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 included15 files

A product spec, phased build plan, differentiation notes, and screen references.

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
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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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

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Rork plan preview for The Chord Detector: 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

Focus on improving audio analysis algorithms.

Assumption to check: Inaccurate chord detection for complex sounds.

Validate with people who use this workflow before building.

Hypothesis 2

Allow users to add and share custom chords.

Assumption to check: Limited chord library with no user-generated content.

Validate with people who use this workflow before building.

Hypothesis 3

Simplify the interface and enhance user flow.

Assumption to check: Cluttered UI with too many options at once.

Validate with people who use this workflow before building.

Hypothesis 4

Make pricing and subscription benefits clearer.

Assumption to check: Subscription model is unclear and difficult to navigate.

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

Chord Detector is an app that will analyse audio sources and automatically detect the musical chords within it. With Chord Detector you can learn to play any track in your devices music library or Dropbox folder providing its not DRM encoded. Chord Detector can also analyse and detect the chords within a YouTube video or a SoundCloud sound. Chord Detector is aimed at musicians of any ability to help you learn to play many more songs, especially those whose chords aren't readily available on the internet. Please note that iTunes Match and Apple Music is not supported due to technical constraints. With our update Chord Detection engine its now much quiker and easier to get most accurate results possible (up to 95% in ideal conditions). Chord Detector can recognise many different chord types including major, minor, augmented, dimimished, diminished7, dominant7 and minorMajor7. To get started just pick one of the four audio source options: ● iPod Music Library ● Dropbox ● YouTube ● SoundCloud You can then select any track from your iPod Music Library(†), Dropbox folder, select a YouTube video or a SoundCloud sound. Chord Detector will then analyse the selected music source and within minutes (if not quicker) you will be presented with a view of the detected chords containing within that music source. You have the option to view the detected chords in two different forms, scrolling and tabular. In both of these views you are able to play the track and the chords will move or be highlighted as the song is playing. You can now start to view the chords of a track when analysis is still ongoing. Also you can queue up tracks to be processed, so while you are learning to play one song the chords are being generated for your other tracks in the background. The following controls are available on the chord view screens:- ● Play/Pause - play or pause the track. ● Rewind 30s - rewind the track by 30 seconds. ● Forward 30s - forward the track by 30 seconds. ● Tempo Adj. - slow down the track without affecting the pitch by a variable amount down to 1/4 of its original speed. ● Capo Adj. - transpose the chords according to which fret you want your capo on Now ukulele, banjo and mandolin chord diagrams are available via an in-app purchase. † The following audio file formats are supported, MP3, AAC, WAV and AIFF. DRM protected content is not supported. Tracks must by sync'd to your device. If you use iTunes Match you must ensure that the track you wish to use in Chord Detector is first downloaded to your device (otherwise you may see a DRM warning) email: [email protected] www: http://www.chord-detector.com twitter: http://twitter.com/chorddetector fb: http://facebook.com/chorddetector

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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.

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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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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.