Harmodus Piano - Pure Tuning

Harmodus Piano - Pure Tuning

Just Intonation & Polyrhythms

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Free
In-App Purchases

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Details

Released
July 18, 2026
Updated
November 4, 2026

Features

Harmodus Piano - Pure Tuning screenshot #1 for iPhone
Harmodus Piano - Pure Tuning screenshot #2 for iPhone
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Harmodus Piano - Pure Tuning screenshot #4 for iPhone
Harmodus Piano - Pure Tuning screenshot #5 for iPhone
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About

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. • 71 languages. Purchase information: All features are free with the 25 keys from C3 to C5 (including black keys), with no time limit. A one-time purchase permanently unlocks the full keyboard and keyboard scrolling; an active monthly or annual subscription also unlocks them. Existing one-time purchases and active subscriptions remain valid. 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/
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What's New in Harmodus Piano

1.07

November 4, 2026

Added Auto mode for just intonation. In Major and Minor modes, tap a key to set a fixed tonic, with a persistent key label and tonic markers. Improved chord detection, sustain, MIDI input, and audio playback stability. Updated privacy declarations. Free-trial messages now appear only after StoreKit confirms eligibility.

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Subscriptions & In-App Purchases

Monthly Plan

Full access to all app features.

$0.491 Month
7 Days trial
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