# Harmonizer vs Sequencer Rack 1

Harmonizer and Sequencer Rack 1 both sit at 4.1 stars, but that hides the real split: 45% of Harmonizer's written reviews are positive against 0% of Sequencer Rack 1's. Harmonizer also leads on price (Free vs $3.99) and in-app purchases (none vs 1). Sequencer Rack 1's advantage is device support (3 vs 1) and iOS requirement (15.6 vs 17.0). On rating and ads there is nothing between them.

Harmonizer is free to download; Sequencer Rack 1 costs $3.99 up front. Sequencer Rack 1 sells 1 one-off in-app purchase. Harmonizer asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.1 for Harmonizer against 4.0 for Sequencer Rack 1. That said, the two scores are not equally well evidenced: Harmonizer has 16 ratings behind it against 2, so its average is the more settled of the two. Written reviews are what separate them: 45% of Harmonizer's written reviews are positive against 0% of Sequencer Rack 1's.

Harmonizer ships an update every 33 months, Sequencer Rack 1 every 91 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Harmonizer | Sequencer Rack 1 |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | **[4.1 (16 ratings)](https://appshunter.io/ios/app/harmonizer/id393762975/reviews)** | [4.0 (2 ratings)](https://appshunter.io/ios/app/sequencer-rack-1-groovebox/id1455358759/reviews) |
| Number of ratings | **16** | 2 |
| Positive reviews | **45.5% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 33 months** | Every 91 months |
| Monetization | **Free** | Paid |
| Size | 3 MB | 26 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Matthew McLaughlin](https://appshunter.io/developer/1671041622) | [Aleksandar Mlazev](https://appshunter.io/developer/1093798140) |

## 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


### Sequencer Rack 1

[App page](https://appshunter.io/ios/app/sequencer-rack-1-groovebox/id1455358759)

Create music and beats with a step sequencer that resembles a compact machine. It offers 16 voices across 16 patterns, with various sounds, effects, and playback controls.

**Highlights:** 16 voices and 16 patterns, 16 diverse sounds (drums, synths, guitars), Chord and synthesizer pad functionality, Phase and virtual speaker effects, Export to WAV, Sound pitch and playback control, Tempo and volume management

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sequencer Rack 1 unlock export | $1.99 | one-time |


## Frequently asked questions

### Is Harmonizer free?

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

### Is Sequencer Rack 1 free?

Sequencer Rack 1 costs $3.99, and also offers in-app purchases.

### Which has better reviews, Harmonizer or Sequencer Rack 1?

Harmonizer is rated higher. Harmonizer averages 4.1 out of 5 from 16 ratings, while Sequencer Rack 1 averages 4.0 from 2 ratings.

### Do Harmonizer or Sequencer Rack 1 have ads?

Neither Harmonizer nor Sequencer Rack 1 shows ads.

### Which is updated more often, Harmonizer or Sequencer Rack 1?

Harmonizer ships an update every 33 months, and Sequencer Rack 1 every 91 months. Most recently, Harmonizer was updated on November 1, 2026 and Sequencer Rack 1 on November 2, 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.*