
Harmodus Piano - Pure Tuning
Just Intonation & Polyrhythms
0 ratings
Free
In-App Purchases
Rating summary
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





