Harmonizr is a vocal harmonizer offering a unique and fun user interface. Plug in a pair of headphones and sing a melody, tapping the correct key center buttons, and Harmonizr will follow, synthesizing up to three voices of automatic harmony in your own voice. Plug in a MIDI keyboard, or use the on-screen one, and you can sing harmony like Imogen Heap or Jacob Collier, matching every note you play. Harmonizr also can also be used as an Audio Unit extension within other apps, such as GarageBand, AUM, or Cubasis, and can be controlled by MIDI controller apps like SoundPrism.

What's New

Version 1.2

Added: On-screen piano keyboard. Several more editable parameters, like glide rate and harmony level. Added an "effect" style AUv3 plugin to enable operation in GarageBand. Better preset editing and reordering.

Fixed: Occasional bursts of stuttering caused by a signal processing bug.

Ratings and Reviews

4.3 out of 5
7 Ratings
7 Ratings

Well done

Harmonizer is a great vocal effects processor but it’s good for musical instruments as well.


Not useful

I can’t hear or use this app. It was not represented correctly and expensive. I regret buying it very much. No instructions at all.

Developer Response

I’m so sorry that you had a bad experience.

If you’d be willing to try again, I released an update that I think makes the experience a lot better. Also, please see the video tutorial at for some examples of usage. I have a lot of fun with it and I really think you will too.

If not, I’d be happy to refund you your purchase. Please email me at


Matthew Robbins
20.9 MB
Requires iOS 10.2 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© Matthew E. Robbins


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

You May Also Like