App Overview

Metronomics Metronome icon

Metronomics Metronome

John Nastos · Music

Metronomics is not only a metronome, but a tool designed to help build a solid sense of time and rhythmic security

$4.99 · In-app purchases

PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
5.0
25 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 Metronomics Metronome: 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

Allow users to create custom rhythms and beats.

Assumption to check: Limited customization options for users

Validate with people who use this workflow before building.

Hypothesis 2

Implement a tutorial mode for first-time users.

Assumption to check: Can be overwhelming for beginners

Validate with people who use this workflow before building.

Hypothesis 3

Add visual cues and animations for better engagement.

Assumption to check: Lack of visual feedback during practice

Validate with people who use this workflow before building.

Hypothesis 4

Provide offline access to basic features for practicing without internet.

Assumption to check: No offline functionality

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

Metronomics is not only a metronome, but a tool designed to help build a solid sense of time and rhythmic security. It's a new kind of metronome -- use Metronomics to generate random patterns, sequenced grooves, or a combination of both to help you practice with more than just your typical click track. Enough features to keep a professional busy for years or start a beginner on the right track. The only metronome that gives you complete control over how subdivisions are played -- add subdivisions of any type (including custom subdivisions like 5/7) and have them played all the time, at random intervals, or in a sequenced pattern. Now available across platforms for both iOS and macOS -- the most powerful metronome, available for all of your devices. Features: - Choose from 40 different samples for each subdivision - Generate patterns using random or sequenced variations of different subdivisions - Include built-in preset patterns such as claves or ride cymbal patterns - Choose any number of beats per measure (with any denominator) you like or practice mixed meters such as 4/4 + 3/8 + 5/4 where the segments of the bar get accented automatically - Use any type of subdivision. Common types like quarter notes, sixteenth notes, eighth triplets, etc, or create your own. 5/7, 23/4, no problem! - Take a rhythm and use the "offset" feature to move it to different parts of the measure to practice with. - Set the metronome to speed up or slow down by a given amount after a set number of measures - Have Metronomics start with a count off - Set the metronome to run for a certain amount of time - Share saved metronomes back and forth with other Metronomics users - Track your metronome usage. App shows how much you've practiced with it each day and total (optionally turn off time tracking) - Train yourself with "independence" mode where you can set some bars to be inaudible -- keep the time going yourself until the click starts again - Variable swing feel -- choose how much each subdivision swings - Speech sounds for counting up to 10 that can be assigned to any subdivision (English language only) - Play in the background - Normalized sounds for good volume - Manual (plus videos) describing how to use all the features and hints about how they might be useful Pro subscription features: - Wheel view that allows you to visualize the passage of subdivisions with geometric shapes - Grid view that lets you easily sequence patterns on a grid much like a drum machine, but with the more-powerful features of Metronomics - Inspector mode -- graph your own playing with microphone or MIDI input and see how you line up with the metronome - iCloud sync -- sync your saved metronomes via iCloud drive - MIDI output -- set subdivisions to send MIDI data to outside MIDI synths or use an on-board synthesizer Within Metronomics, there is an option to upgrade to Metronomics Pro, which is an auto-renewing yearly subscription service. It enables the following features: Subscription details: - Service: Metronomics Pro - Time period: one year, auto-renewing subscription - Payment will be charged to iTunes Account at confirmation of purchase - Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period - Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal - Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user’s Account Settings after purchase - Privacy policy: https://metronomicsapp.com/privacy.html / Terms of use: https://metronomicsapp.com/terms.html - Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable.

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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
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expo-av
react-native-reanimated
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.