App Overview

Smart Metronome & Tuner icon

Smart Metronome & Tuner

Tomohiro Ihara · Music

The "Three Essentials" of music practice, unified on one screen.

Free · In-app purchases

PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
4.7
60,215 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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Build Kit

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A product spec, screen plans, and build steps for your coding agent.

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Combine features and design from your favorite apps.

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What's included18 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 Smart Metronome & Tuner: 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

Add advanced features like rhythm patterns and customizable tunings.

Assumption to check: Limited feature set compared to competitors

Validate with people who use this workflow before building.

Hypothesis 2

Offer more value in the free version to retain users.

Assumption to check: In-app purchase for ad-free experience

Validate with people who use this workflow before building.

Hypothesis 3

Prioritize audio stability and performance in the clone.

Assumption to check: Occasional bugs with audio playback

Validate with people who use this workflow before building.

Hypothesis 4

Focus on clean UI design and better organization of features.

Assumption to check: User interface can feel cluttered

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

The "Three Essentials" of music practice, unified on one screen. Metronome, Tuner, and Recorder. We have integrated the three indispensable tools for every musician into one elegant and intuitive interface. No more switching between apps—stay fully focused on your music. - Professional Precision: 1/44,100 sec. Do you have doubts about the accuracy of digital metronomes? Smart Metronome controls timing and sound playback via hardware, not just software. This guarantees an exact pulse, independent of CPU load, with a precision of 1/44,100th of a second. Technically, it is the same as listening to a recorded CD. - Ultra-Realistic Visual Pendulum We have recreated the physical movement of a mechanical metronome. The sound triggers exactly as the pendulum passes through the center, allowing you to "see" the tempo as well as hear it for intuitive synchronization. - Exclusive Features to Maximize Your Efficiency *** 3-in-1 Interface: Everything at Once** Tune your instrument while you play. Record your session instantly and analyze rhythmic errors visually thanks to the "Metronome Guide" overlaid on the audio waveform. *** Repeat Mode: Master Difficult Passages** Ideal for tackling tricky sections. Start at a slow tempo and increase the speed automatically. Set the start and goal tempos and the number of repetitions to build your scales and arpeggios with total focus. *** Program Mode: For Complex Pieces** Freely program changes in time signature, tempo, and bar counts. Perfect for contemporary music or pieces with shifting rhythms (rit. / accel.). Includes rehearsal marks on screen so you always know where you are in the score. *** Continuous Timer & LOG: Practice Management** Manage your routines with the continuous timer. Every minute of your practice is saved in the LOG, allowing you to visualize your progress and consistency over time. - Key Features at a Glance Unified Interface: Metronome, Tuner, and Recording on a single screen. Customization: Set your favorite colors and choose from a wide range of sounds. Drum Machine: High-quality percussion and drum sounds. Setlist: Save and organize tempos for your entire repertoire. Versatility: Excellent for music, but also for gym routines or interval training. Make your daily practice more enjoyable, rigorous, and effective with Smart Metronome!

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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
React Navigation
Redux
expo-av
react-native-slider
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.