Harmonizr

Name: Harmonizr
Price: 4.99 USD
Rating: 4.2 (27 reviews)
Author: Matthew Robbins

By: Matthew Robbins

smart musical harmonizer

Features & Capabilities

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 (AUV3) extension within other apps, such as GarageBand, AUM, or Cubasis, and can be controlled by MIDI controller apps like SoundPrism.

User Growth & Download Statistics

App

By:

Matthew Robbins

Rating:

4.20

(27)

Version:

1.9 Last updated: 2026-05-14

Version code:

885680291

Creation date:

2018-05-31

Compatible devices:

Size:

5.41MB

Price:

4.99

URLs:

Full description:

Source:

Apple Apps Store

Data ingested on:

2026-06-05

Compare stats and ranking:

Ranking

# 257,906 ▼ 749

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

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Developed by:

Matthew Robbins

Apple Apps Store

https://apps.apple.com/us/app/harmonizr/id1348742174

User Reviews

Reviewers praise Harmonizr for its high-quality vocal harmonies and professional sound, especially with a good mic. It’s easy to use out of the box, with a helpful tutorial, and offers deep customization via presets and MIDI/audio control. It also has strong hardware/DAW integration (USB MIDI, iRig, Audiobus) and a responsive developer who updates the app. Recurrent downsides include limited in-app help, incomplete inter-app workflow (GarageBand/BandLab) for recording, and MIDI control gaps (no easy bypass or CC mapping). A few users report occasional setup issues.

Pros

High-quality vocal harmonies and professional sound, especially with a good mic.
Easy to use out of the box with a helpful tutorial.
Deep customization via presets and MIDI/audio control.
Strong hardware/DAW integration (USB MIDI, iRig, Audiobus) and good for live workflow.
Responsive developer and frequent updates.

Cons

Lack of in-app help/documentation; unclear what buttons do.
Limited inter-app workflow; difficult to use with GarageBand/BandLab or to record generated harmonies in other apps.
MIDI control gaps; no easy bypass or MIDI CC mapping, more integration needed.
Occasional setup/compatibility issues reported by some users.

Recent reviews

Hi - I bought this and I wonder if the reason it doesn’t work is that you haven’t updated it to work with Apples iOS systems. Please let me know as I do not get the menu screens you show online.

by LN*****, 2023-02-26

Harmonizr was unavailable for a little while, but the great Developer has reopened it back on the App Store. Buy it while you can it is THE best vocal processing harmony app available. Cheers and thank you to Matthew Robbins!

by Gl*****, 2022-08-25

It seems like a really cool and useful app for what I’d like to do. The keyboard, however, doesn’t produce sound. What you see are lights blinking on the keys which are, I’m guessing, related to the key you’re in. Beyond that, I can’t hear anything. Would love to try out the whole app soon. Thank you.