Harmodus Piano: Pure Tuning

Pure tuning piano & metronome

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

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. Subscription information: Access to all features requires the separate purchase of a monthly or annual auto-renewable subscription. Eligible new users may be offered a 7-day free trial with either the monthly or annual plan. 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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The developer, Jumpei Yamaguchi, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

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    Accessibility

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    Information

    Seller
    • Jumpei Yamaguchi
    Size
    • 154.4 MB
    Category
    • Music
    Compatibility
    Requires iOS 16.0 or later.
    • iPhone
      Requires iOS 16.0 or later.
    • iPad
      Requires iPadOS 16.0 or later.
    • Mac
      Requires macOS 13.0 or later and a Mac with Apple M1 chip or later.
    Languages
    • Japanese
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    • © 2026 MusicaTechLab
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Some in-app purchases and subscriptions may be shareable with your family group when Family Sharing is enabled. Learn More