# Harmodus Piano - Pure Tuning

> Just Intonation & Polyrhythms

Canonical page: [https://chrome-stats.com/d/id6786988622](https://chrome-stats.com/d/id6786988622)

## Overview

- **ID:** `id6786988622`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Jumpei Yamaguchi
- **Category:** Music
- **Version:** 1.04
- **Last updated:** 2026-08-08
- **First published:** 2026-07-18
- **Size:** 147 MB
- **Data as of:** 2026-09-05
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/harmodus-piano-pure-tuning/id6786988622)
- **Website:** [https://harmoduspiano.musicatechlab.com/](https://harmoduspiano.musicatechlab.com/)
- **Privacy policy:** [https://harmoduspiano.musicatechlab.com/privacy/](https://harmoduspiano.musicatechlab.com/privacy/)

## Description

A piano and metronome with just intonation. Real-time chord detection, 18 sound sources, and a metronome for odd meters, tuplets and polyrhythms.

Harmodus Piano is a piano keyboard and metronome app with just intonation.

JUST INTONATION
• Real-time retuning: the app analyzes the chord you hold and applies pure frequency ratios to its root.
• Switch between Equal, Just Major and Just Minor.
• Adjustable reference pitch.

CHORD DETECTION
• 17 chords detected in real time from the notes you play.
• Works with the on-screen keyboard and external MIDI.

18 SOUND SOURCES
• Acoustic and synthesizer timbres — organ, clarinet and more, plus waveforms such as sine and sawtooth.
• Damper pedal with natural resonance.

METRONOME
• 6-track mixer: accent, quarter, eighth, sixteenth, triplet and a custom n-tuplet.
• Odd meters (5, 7, …) add a second accent automatically.
• Tuplets and 2-beat n-tuplets (e.g. half-note triplets).
• A/B alternating patterns, tap tempo, count-in and auto-stop.
• Visible edge-flash and per-track click sounds.

MORE
• Touch and MIDI keyboard (Bluetooth or cable).
• Transpose, sustain / latch.
• 34 languages.

Purchase information:
Access to all features requires the separate purchase of either a monthly or annual auto-renewable subscription, or a one-time purchase.
Eligible new users may be offered a 7-day free trial with either the monthly or annual plan. The one-time purchase does not auto-renew.

Terms of Use (Apple Standard EULA):
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy:
https://harmoduspiano.musicatechlab.com/privacy/

## Rankings

- #1,411,497 — Overall

## Similar extensions and apps

- [HarmoTuner](https://chrome-stats.com/d/id6780727272)
- [MultiTuneKeys](https://chrome-stats.com/d/id6764493629)
- [Harmony Keyboard](https://chrome-stats.com/d/id6745786039)
- [Ahns Metronome](https://chrome-stats.com/d/id6762518148)
- [Tuning Helper](https://chrome-stats.com/d/id6498717890) — 5.00 / 5
- [Piano Tuner & Metronome](https://chrome-stats.com/d/id6759902104)
- [Metronome IKI](https://chrome-stats.com/d/id6763413419)
- [PolyNoise Musical Metronome](https://chrome-stats.com/d/id6538728518)
- [Tune Time - musician toolkit](https://chrome-stats.com/d/id6760885904) — 5.00 / 5
- [Tempi - Metronome and Tuner](https://chrome-stats.com/d/id6761413054)
- [Cello Tuner - PRO](https://chrome-stats.com/d/id1270486103) — 3.50 / 5
- [Smart Metronome & Tuner +](https://chrome-stats.com/d/id1077134281) — 4.80 / 5

---

Source: [Chrome-Stats](https://chrome-stats.com/d/id6786988622)