App Overview

Chordbot icon

Chordbot

Contrasonic AB · Music

Chordbot lets you create and play chord progressions in different styles easily

$4.99 · In-app purchases

PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.6
39 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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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 Chordbot: 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 chord library and allow users to create custom chords.

Assumption to check: Limited chord selection and customization options.

Validate with people who use this workflow before building.

Hypothesis 2

Incorporate social sharing to allow users to share their progressions.

Assumption to check: No social sharing features.

Validate with people who use this workflow before building.

Hypothesis 3

Implement offline functionality for users to access their progressions anywhere.

Assumption to check: No offline capabilities.

Validate with people who use this workflow before building.

Hypothesis 4

Clarify pricing tiers and provide a clear value proposition for each.

Assumption to check: In-app purchases 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

Chordbot lets you create and play chord progressions in different styles easily. Just add chords, select instrument tracks and hit play. Experiment with complex chord progressions without having to master an instrument or music theory first. Great for songwriting experiments or to create your own backing tracks for instrument practice. Easily create arrangements and mixes by selecting from hundreds of piano, guitar, synth, bass and drum tracks. This is the full version of Chordbot with all features enabled. There is also a free evaluation version (Chordbot Lite) with disabled save/export features that you could/should try before buying the paid version. Features: * 60+ chord types Including classics like AugAdd2 and Min7(#11), in all inversions. * 70+ comping style presets Simple but usable arrangements that won't get in your way. * 400+ instrument tracks Individually mixable dynamic instrument tracks that can be combined to form unique comping styles. * Inversion control / slash chords Manually select chord inversions, or let Chordbot select the smoothest inversion automatically. * Song sections Songs can be structured into repeatable sections (verse, chorus, etc). Each section can have its own comping style/arrangement. * MIDI/WAV export and background playback Refine your compositions in a DAW/MIDI sequencer or play along with a virtual instrument * Song-O-Matic Automatic song generator with pop, jazz and experimental profiles. See chordbot.com for more information and audio demos. Please report all bugs to: [email protected]

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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
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.