App Overview

Intonalogy icon

Intonalogy

Thomas Verrier · Music

learn to precisely tune pitches in randomly generated chords, scales and melodies, using equal temperament or just intonation! hone your skills in the fully customizable training mode, or test yourself and go for a hi...

$4.99 · In-app purchases

PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
5.0
3 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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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.

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 Intonalogy: 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

Introduce new exercises and challenges regularly.

Assumption to check: Lack of variety in exercises can lead to user boredom.

Validate with people who use this workflow before building.

Hypothesis 2

Focus on high-quality audio recordings.

Assumption to check: Some users may find the audio quality inconsistent.

Validate with people who use this workflow before building.

Hypothesis 3

Add social sharing options for users to share achievements.

Assumption to check: Limited social features for sharing progress.

Validate with people who use this workflow before building.

Hypothesis 4

Offer more free content to entice users to subscribe.

Assumption to check: Paywall may deter new users.

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

learn to precisely tune pitches in randomly generated chords, scales and melodies, using equal temperament or just intonation! hone your skills in the fully customizable training mode, or test yourself and go for a high score at one of three preset difficulty levels in challenge mode. now with new features for use in the classroom! key features: - 18 intervals, 9 chords, and 21 scales to tune in equal temperament or just intonation - fully customizable training mode which tracks your average error - challenge mode which generates 10 exercises at one of three preset difficulty levels and provides a total score out of 1000 - timed exercise mode available for an extra challenge - 36 high scores categorized by difficulty, exercise type, tuning system, and timed/free play mode - 20 general settings including concert pitch, chord voicing and relative volumes, and a choice of three instrument samples - dozens of difficulty settings including full customization of the available scales, intervals, chords, and inversions - detailed about page describing the just intonation system and listing the ratios used - assignments: custom challenges which can be created by instructors and distributed to students - create a student or teacher account - as a teacher, create classes and assignments and fully customize difficulty, number of exercises, number of attempts allowed and more - as a student, join classes and complete assignments, submitting your best score - teachers can see each student's assignments, scores and total/average error

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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
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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.