# Harmonizr vs OCTACHRON MIDI Drum Sequencer

The clearest difference is rating: OCTACHRON MIDI Drum Sequencer at 4.6 against Harmonizr's 4.2. OCTACHRON MIDI Drum Sequencer also leads on update cadence (every 2 months vs every 4 months) and ratings volume (106 vs 27). Harmonizr's advantage is price ($4.99 vs $9.99). On review sentiment, ads, in-app purchases and monetization model there is nothing between them.

Harmonizr costs $4.99 and OCTACHRON MIDI Drum Sequencer $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

OCTACHRON MIDI Drum Sequencer holds the better App Store score, 4.6 against 4.2. Both are backed by a comparable volume of ratings — 27 and 106 respectively. Written reviews point the same way: 74% of Harmonizr's written reviews are positive against 81% of OCTACHRON MIDI Drum Sequencer's.

Harmonizr ships an update every 4 months, OCTACHRON MIDI Drum Sequencer every 2 months. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Harmonizr | OCTACHRON MIDI Drum Sequencer |
| --- | --- | --- |
| Price | **$4.99** | $9.99 |
| Rating | [4.2 (27 ratings)](https://appshunter.io/ios/app/harmonizr/id1348742174/reviews) | **[4.6 (106 ratings)](https://appshunter.io/ios/app/octachron-midi-drum-sequencer/id1453137215/reviews)** |
| Number of ratings | 27 | **106** |
| Positive reviews | 73.9% of reviews | **81.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Paid | Paid |
| Size | 5 MB | 12 MB |
| Requires iOS | 18.6 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Matthew Robbins](https://appshunter.io/developer/1348742173) | [Markus Teufel](https://appshunter.io/developer/1104803847) |

## What reviewers say

### Harmonizr

[App page](https://appshunter.io/ios/app/harmonizr/id1348742174)

This app allows users to create vocal harmonies by singing along to a melody. It synthesizes up to three harmony voices in the user's own voice and can be controlled via MIDI input or used as an extension in other music production apps.

**Highlights:** Automatic vocal harmony synthesis, Real-time key center selection, MIDI keyboard integration, On-screen MIDI keyboard, Audio Unit (AUV3) extension support, Control via MIDI controller apps

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

**In-app purchases:** none


### OCTACHRON MIDI Drum Sequencer

[App page](https://appshunter.io/ios/app/octachron-midi-drum-sequencer/id1453137215)

This app is a flexible MIDI drum sequencer for iOS, offering up to 16 tracks with advanced modulation and sequencing. It can be used standalone or as an AUv3 plugin in DAWs, and is optimized for drums but also suitable for melodies. It requires iOS 12 or higher.

**Highlights:** 16 mutable tracks, AUv3 MIDI plugin, Standalone operation, Parameter locking, Smart randomizer, Chainable patterns, Custom time signatures

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

**In-app purchases:** none

**What reviewers like**

- 👍 Intuitive and easy to use
- 💡 Powerful and versatile sequencer
- 🚀 Produces results quickly
- 🌟 Great for drum patterns
- 🎛️ Excellent modulation options

**What reviewers complain about**

- 🐛 Pattern change via MIDI difficult
- ❓ Clock div issues reported
- 💡 Missing touchable pads
- ❓ No sound output reported
- 🐛 Projects broken by update

**Reported bugs**

- Clock div issues reported
- No sound output reported
- Projects broken by update
- Skipping first note on pattern change
- GUI glitchy/choppy

**Requested features**

- Add touchable pads
- Add MIDI Step record feature
- Add triplets
- Add MIDI file export and import
- Add system-wide preset save and load


## Frequently asked questions

### Is Harmonizr free?

Harmonizr costs $4.99, with no in-app purchases.

### Is OCTACHRON MIDI Drum Sequencer free?

OCTACHRON MIDI Drum Sequencer costs $9.99, with no in-app purchases.

### Which has better reviews, Harmonizr or OCTACHRON MIDI Drum Sequencer?

OCTACHRON MIDI Drum Sequencer is rated higher. Harmonizr averages 4.2 out of 5 from 27 ratings, while OCTACHRON MIDI Drum Sequencer averages 4.6 from 106 ratings.

### Do Harmonizr or OCTACHRON MIDI Drum Sequencer have ads?

Neither Harmonizr nor OCTACHRON MIDI Drum Sequencer shows ads.

### Which is updated more often, Harmonizr or OCTACHRON MIDI Drum Sequencer?

Harmonizr ships an update every 4 months, and OCTACHRON MIDI Drum Sequencer every 2 months. Most recently, Harmonizr was updated on October 26, 2026 and OCTACHRON MIDI Drum Sequencer on October 24, 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.*