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 1.3

* Fixed problem with MIDI button not turning off manual voices.
* Harmonizr now responds to MIDI program change messages, allowing it to follow your other MIDI gear from song to song on stage.
* Added new stereo modes: mono, and split, where the dry signal goes in channel one, and the harmony voices in channel 2.
* Cosmetic improvements to the interface.

Ratings and Reviews

4.5 out of 5
11 Ratings
11 Ratings
swancakes ,

Really good and getting better

I’ve been really impressed with this app and am working it into my live workflow. I love the amount of options it provides for control of harmonies, wet/dry, pitch correction, etc. Like another reviewer mentioned, a way to assign bypass to a MIDI cc would be helpful, as well as the ability to use the ‘solo’ feature when not passing the dry signal (ie, temporarily pass dry signal when in solo mode, for announcements). Now just waiting for BeatMaker 3 to support MIDI AU... This app has crazy potential once MIDI AU gains more adoption. Thank you for your hard work!

Glishba ,

Thank you Matthew Robbins!!!

I just want to take a moment to THANK this developer for creating such a fantastic harmonizing app. There are several out there, but this one is great for singing, sounds the most realistic for iOS. I can connect my MIDI Keyboard to it and create my own vocal harmonies to whatever I play on the keyboard, which is amazing. Everybody please buy this thing, this guy needs some support for his great work!

itsrifat ,

Would give a 5 star if had support for midi controller

Great app. Works fine with audiobus. Would be nice to have the ability to turn on/off the harmonizr through usb midi controller. I see it has an option to pair bluetooth midi controller, but not sure what it does since i don't have one.


Matthew Robbins
19.1 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.

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