# StepPolyArp vs OCTACHRON MIDI Drum Sequencer

The clearest difference is price: OCTACHRON MIDI Drum Sequencer at $9.99 against StepPolyArp's $19.99. OCTACHRON MIDI Drum Sequencer also leads on in-app purchases (none vs 2) and iOS requirement (12.0 vs 15.0). StepPolyArp's advantage is rating (4.8 vs 4.5). On review sentiment, ratings volume, update cadence and ads there is nothing between them.

StepPolyArp costs $19.99 and OCTACHRON MIDI Drum Sequencer $9.99 up front. StepPolyArp sells 2 one-off in-app purchases. OCTACHRON MIDI Drum Sequencer asks for nothing beyond the download.

StepPolyArp holds the better App Store score, 4.8 against 4.5. Both are backed by a comparable volume of ratings — 48 and 104 respectively. Written reviews point the same way: 87% of StepPolyArp's written reviews are positive against 81% of OCTACHRON MIDI Drum Sequencer's.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 22, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | StepPolyArp | OCTACHRON MIDI Drum Sequencer |
| --- | --- | --- |
| Price | $19.99 | **$9.99** |
| Rating | **[4.8 (48 ratings)](https://appshunter.io/ios/app/steppolyarp/id1361313588/reviews)** | [4.5 (104 ratings)](https://appshunter.io/ios/app/octachron-midi-drum-sequencer/id1453137215/reviews) |
| Number of ratings | 48 | **104** |
| Positive reviews | **86.7% of reviews** | 80.8% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Paid | Paid |
| Size | 38 MB | 12 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Laurent Colson](https://appshunter.io/developer/381525765) | [Markus Teufel](https://appshunter.io/developer/1104803847) |

## What reviewers say

### StepPolyArp

[App page](https://appshunter.io/ios/app/steppolyarp/id1361313588)

This app functions as a real-time polyphonic and polyrhythmic MIDI step arpeggiator and sequencer. It can generate melodic patterns from input or operate as a standalone sequencer. Save and sync unlimited presets with iCloud, featuring extensive customization for patterns and step controllers.

**Highlights:** Standalone app and AUv3 MIDI effect plugin, Arpeggiator and step sequencer modes, Programmable step matrix with transposition lines, Polyrhythmic step controllers, Internal sound bank, Ableton Link and MIDI sync support, Unlimited preset saving with iCloud sync

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Dance Horizons | $4.99 | one-time |
| Analog Sequence | $4.99 | one-time |


### 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 StepPolyArp free?

StepPolyArp costs $19.99, and also offers 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, StepPolyArp or OCTACHRON MIDI Drum Sequencer?

StepPolyArp is rated higher. StepPolyArp averages 4.8 out of 5 from 48 ratings, while OCTACHRON MIDI Drum Sequencer averages 4.5 from 104 ratings.

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

Neither StepPolyArp nor OCTACHRON MIDI Drum Sequencer shows ads.

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

StepPolyArp ships an update every 2 months, and OCTACHRON MIDI Drum Sequencer every 2 months. Most recently, StepPolyArp was updated on September 22, 2026 and OCTACHRON MIDI Drum Sequencer on September 18, 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.*