PolyHarp 4+

An extremely chorded zither‪.‬

Henry Lowengard

    • 4.9 • 10 Ratings
    • $4.99

iPad Screenshots


PolyHarp is a virtual musical instrument and a thought experiment.

It takes the basic idea of a chorded zither and extends it to large numbers of chord choices, made out of any kinds of intervals, multi-string courses, fretting, and massive polyphony. It's a testbed for harmonic theory as well as a great multi touch simulation of the good old "idiot zither" you have in the attic. PolyHarp can translate many of these innovations to MIDI and is a powerful MIDI controller.

PolyHarp comes with a large number of presets, exploring many variants on stringed instruments, but its real power is its ability to build strange new chords, layouts, and controls into otherwise impossible instruments.

PolyHarp supports Audiobus 3, including saving setups, and IAA.

What’s New

Version 1.0.17

Fixed some things that mostly annoyed me, having to do with using MIDI CC01 as a modulator destination, which was actually sending CC00.

Ratings and Reviews

4.9 out of 5
10 Ratings

10 Ratings

Wet Food ,

So much better than what you think it is.

Simply brilliant and deep

Oceans in space ,

Brilliant genius

This app creator must be an enlightened sound designer! This app is so intricate and Intense with its almost overwhelming. This thing so far is like a stringed blank slate with anything you want to create even odd harmonic subdividing it’s here. Midi out and your golden. All his apps are creative but this is the magnum opus

JohnFBP ,

Weird and Beautiful

Such a deep and deeply weird little app. A simple idea done extremely well. Do it!

App Privacy

The developer, Henry Lowengard, 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

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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