# Harmonizer vs AUMI

The clearest difference is rating: AUMI at 5.0 against Harmonizer's 4.1. AUMI also leads on update cadence (every 6 months vs every 33 months) and device support (3 vs 1). Harmonizer's advantage is ratings volume (16 vs 4). On price, review sentiment, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

AUMI holds the better App Store score, 5.0 against 4.1. Both are backed by a comparable volume of ratings — 16 and 4 respectively. Written reviews point the same way: 45% of Harmonizer's written reviews are positive against 50% of AUMI's.

Harmonizer ships an update every 33 months, AUMI every 6 months. Both last shipped on November 1, 2026.

## The numbers

| Metric | Harmonizer | AUMI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (16 ratings)](https://appshunter.io/ios/app/harmonizer/id393762975/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/aumi/id647002265/reviews)** |
| Number of ratings | **16** | 4 |
| Positive reviews | 45.5% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 33 months | **Every 6 months** |
| Monetization | Free | Free |
| Size | 3 MB | 69 MB |
| Requires iOS | 17.0 | **12.4** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Matthew McLaughlin](https://appshunter.io/developer/1671041622) | [Rensselaer Polytechnic Institute](https://appshunter.io/developer/545728224) |

## What reviewers say

### Harmonizer

[App page](https://appshunter.io/ios/app/harmonizer/id393762975)

This app helps infants develop perfect pitch by playing Shepard tones, aiding in pitch identity development. It also facilitates the study of chord relationships and displays the pitch of your singing.

**Highlights:** Shepard tone playback, Pitch identity development, Chord relationship study, Vocal pitch display, Infant music education

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### AUMI

[App page](https://appshunter.io/ios/app/aumi/id647002265)

This app allows individuals with limited mobility to create music through movement and gestures. It focuses on improvisation and self-expression, making music accessible to a wider range of people, including those with profound physical disabilities.

**Highlights:** Music creation through movement and gestures, Focus on improvisation and self-expression, Accessible for individuals with profound physical disabilities, Uses device cameras for input, Configurable sound sensitivity, MIDI controller functionality, Import audio from other apps

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Harmonizer free?

Harmonizer is free to download, with no in-app purchases.

### Is AUMI free?

AUMI is free to download, with no in-app purchases.

### Which has better reviews, Harmonizer or AUMI?

AUMI is rated higher. Harmonizer averages 4.1 out of 5 from 16 ratings, while AUMI averages 5.0 from 4 ratings.

### Do Harmonizer or AUMI have ads?

Neither Harmonizer nor AUMI shows ads.

### Which is updated more often, Harmonizer or AUMI?

Harmonizer ships an update every 33 months, and AUMI every 6 months. Most recently, Harmonizer was updated on November 1, 2026 and AUMI on November 1, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*