# StepPolyArp — Step Arpeggiator/Sequencer

> Polyphonic and polyrhythmic MIDI step arpeggiator and sequencer. (iPhone/iPad app by Laurent Colson.)

- Source: https://appshunter.io/ios/app/steppolyarp/id1361313588 (this page in markdown: same URL + `.md`)
- Developer: [Laurent Colson](https://appshunter.io/developer/381525765)
- Category: Music
- Price: $19.99 with in-app purchases
- Rating: 4.80/5 from 48 App Store ratings · 45 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 38 MB
- Languages: American English
- Released: 2018-07-25
- Data updated: 2026-08-27
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/steppolyarp/id1361313588/reviews.md

## What is StepPolyArp?

"StepPolyArp" is a real-time polyphonic and polyrhythmic MIDI step arpeggiator and step sequencer. It can be used as a standalone application or as an AUv3 MIDI effect plug-in.

The application and the plug-in can operate as a step arpeggiator, automatically generating melodic patterns from played notes or chords, or as a step sequencer that does not require MIDI input to play.

Unlimited presets can be saved locally and synchronized with iCloud. Each preset contains 16 patterns, 5 customizable polyrhythmic step controllers, and a 32-step event matrix with 11 polyphonic and polyrhythmic lines driving the arpeggiator engine.

The application supports full internal and external MIDI connections for input and output, Ableton Link synchronization, and MIDI clock synchronization. An internal sound bank is included.

The AUv3 MIDI effect plug-in supports multiple instances. A compatible host is required to run the plug-in. The host must support the Audio Unit v3 (AUv3) MIDI effect format.

Hosts supporting AUv3 MIDI effect on iOS: 
Logic Pro, Cubasis, Beatmaker, AUM, Audiobus, NanoStudio, Auria Pro, apeMatrix.

Hosts supporting AUv3 MIDI effect on macOS:
Logic Pro 10.7 or later.

Features:

• Standalone application and AUv3 MIDI effect plug-in
• Arpeggiator and step sequencer mode
• 1 to 32-step programmable matrix
• 11 configurable transposition lines
• Polyrhythmic lines and clock dividers per line
• Mute by line
• Gate, velocity, probability, random pitch, random gate, and random velocity per event
• 16 patterns by preset
• Automatic pattern chaining
• 8-octave resizable keyboard
• Multitasking support
• Stop "Audio Background" automatically after inactivity (15 min, 30 min, 1 h, 2 h, or never)
• Sample-accurate timing
• Internal sound bank
• Tap tempo
• Receiving MIDI from external MIDI sources
• Receiving external MIDI sync (MIDI clock)
• Ableton Link support
• Internal routing of inputs, outputs, and MIDI sync
• Send MIDI to a virtual port usable as MIDI input by other "Core MIDI" compatible apps
• Default velocity, modulation, pan, volume, aftertouch, and pitch bend step controllers
• Customizable MIDI setup for step controllers
• Arpeggiator and sequencer can conform to the selected scale
• Predefined scales and possibility to create custom scales
• 6 arpeggiator modes
• 1 random mode
• 1 chord mode
• Randomization panel for generating random patterns with a large number of parameters to control the result
• Preset manager with support for in-app purchase packs
• "Program Change" support
• Preset sharing via "AirDrop", "Mail", "Messages", and other supported services
• Native iCloud support
• "iCloud Drive" support in the "Files" app on iOS and "Finder" on macOS
• Full support of "Windowed Apps" mode on iPad
• Undo/Redo
• Lockable keyboard (latch mode)

Supported MIDI connections:

• Virtual "Core MIDI" connections between applications
• Any compatible MIDI interface
• MIDI over Wi-Fi
• MIDI over Bluetooth
• Ableton Link (sync and transport)

## Key features

- 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

## Pricing and in-app purchases

Base price: $19.99.

**One-time purchases**

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


## Recent user reviews (10 of 45)

All indexed reviews: https://appshunter.io/ios/app/steppolyarp/id1361313588/reviews.md

### 5/5 — very useful application

*2026-02-05*

I like this application. Unfortunately, I couldn't update the older Mac version 4.52 to the current version.

However, the developer contacted me immediately and provided truly exceptional support. He explained everything in detail and invested a lot of time. Now the current version runs perfectly on my Mac mini and also on my iPad. 
Thank you so much, Mr. Colson

### 5/5 — Keep coming back

*2025-10-24, version 5.1*

I bought this app maybe 10+ years ago, and from time to time I get into song making, and every time I love this app the most. Probably one of the best developers and I am sorry I only paid this once! Get it

### 5/5 — The best sequencer

*2025-10-11*

Le meilleur séquenceur pour moi

### 5/5 — Masterful

*2025-07-02, version 5.0.3*

Such a good MIDI controller, can be used as an arp or sequencer, with patterns for song mode and even sends CC controls. Easy to use with many options, the best MIDI sequencer I have used on iPad.

### 5/5 — Really exceptional app.

*2025-04-25, version 5.0.3*

Initially I found this as a workaround to some USB MIDI controller’s native arpeggiators that were very jittery. Other arp apps had some features but were missing others. This has everything! I’ve actually replaced the hardware controller’s arpeggiator with StepPoly entirely and programmed it via MIDI Learn in AUM to do everything the controller did and more! Everything stays perfectly in sync and has every arp parameter imagineable. Good job!

### 5/5 — StepPolyArp Rocks for Music Production!

*2025-03-26, version 5.0.2*

This is an amazing app that lets you create and play arpeggios or sequences with ease. It is very well thought out.  I use it to play Korg synths via Korg Gadget, and to create a complex or simple backing through a Korg Pa arranger.  You should have a basic understanding of midi if you want to drive internal or external synths.  Also, basic music theory is helpful for understanding scales, etc.

### 5/5 — L'arpègiateur ultime sur iPad

*2025-02-28*

Vraiment très complet. Il faut ce mettre dedans au début mais ça en vaut la peine. La dernière mise à jour apporte pas mal de nouvelles fonctionnalités sans surcharger l'écran. Et cette dernière mise à jour a règle mes problèmes de latence \o/ -- Very update, thanks! (Jan 2024) --

### 5/5 — 2025 updates are so dope

*2025-01-13, version 5.0.1*

The gating and improved UI and random features are very good. Would be interesting to see some of the features like Omnisphere’s arp has on desktop, or warping features to play with time. I bought chordpolypad as sort of a tip for your updates not thinking I needed it, but found it works well with StepPolyArp.

### 5/5 — Brilliant

*2025-01-09*

The new update is brillian !

### 5/5 — Mega Update

*2025-01-09, version 5.0*

Benutze ihn schon paar Jahre hauptsächlich als Sequenzer. Sehr empfehlenswert und klasse Design gut gemacht. Mit vielen nützlichen Funktion

## Frequently asked questions about StepPolyArp

### What does StepPolyArp do?

StepPolyArp is a real-time polyphonic and polyrhythmic MIDI step arpeggiator and step sequencer. It can automatically generate melodic patterns from played notes or chords, or function as a standalone sequencer without MIDI input.

### What are the key features of StepPolyArp?

Key features include its ability to function as both a standalone application and an AUv3 MIDI effect plugin, offering arpeggiator and step sequencer modes. It boasts a programmable matrix, configurable transposition lines, polyrhythmic step controllers, an internal sound bank, and comprehensive MIDI and Ableton Link synchronization.

### How much does StepPolyArp cost?

The application is a paid app. There are no mentions of in-app purchases or subscription models in the provided description, indicating a one-time purchase.

### What devices is StepPolyArp compatible with?

StepPolyArp is available as a standalone application and an AUv3 MIDI effect plugin. The AUv3 plugin requires a compatible host application that supports the Audio Unit v3 MIDI effect format, such as Logic Pro, Cubasis, AUM, and others on iOS and macOS.

### Can I save and share my creations?

Yes, you can save unlimited presets locally, which can be synchronized with iCloud. Each preset includes 16 patterns and extensive customization options. Presets can also be shared via services like AirDrop, Mail, and Messages.

## Version history (last 5 releases)

### 6.0 — 2026-07-15

• Pattern playback can proceed automatically to the next pattern, to a specific pattern, or even to a random pattern
• A pattern can be defined as the default pattern for each playback restart

• The loop count for chaining to another pattern increments only after all the pattern's lines have been fully read at least once
• Redesigned preset selector with support for In-App Purchase packs
• Two new preset packs available as In-App Purchases: Analog Sequence and Dance Horizons. Each includes 6 free demo presets.
• Reordering the lines no longer causes synchronization issues between the lines during playback

• The pattern player has been revised to fix issues with automatic sequencing that could, in some cases, cause a step to be skipped
• Minor bugs fixed

### 5.2 — 2026-01-30

• New option to automatically stop Audio Background when the app is inactive (15 min, 30 min, 1 h, 2 h, or never)
• Standardized scale names for improved clarity
• Minor bugs fixed

### 5.1.1 — 2025-11-11

• Minor bugs fixed

### 5.1 — 2025-09-24

• Full compatibility with iOS / iPadOS 26
• Support for Windowed Apps mode on iPad
• Integration of the new menu bar in iPadOS 26
• Stability and performance improvements

### 5.0.3 — 2025-04-05

• Fixed a bug in the grid's "Move Left" function that caused some values ​​to not be shifted
• Fixed a bug where the first note of a new pattern is the one from the previous pattern
• Minor bugs fixed

## Apps similar to StepPolyArp

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Prism MIDI Sequencer](https://appshunter.io/ios/app/prism-midi-sequencer/id6502302630) | 4.8 (33) | $19.99 | Music |
| [QuadroSphere](https://appshunter.io/ios/app/quadrosphere/id6740915664) | 5.0 (10) | $14.99 | Music |
| [Mozaic Plugin Workshop](https://appshunter.io/ios/app/mozaic-plugin-workshop/id1457962653) | 5.0 (81) | $1.99 | Music |
| [Xequence 2](https://appshunter.io/ios/app/xequence-2/id1464669442) | 4.6 (65) | $19.99 | Music |
| [OCTACHRON MIDI Drum Sequencer](https://appshunter.io/ios/app/octachron-midi-drum-sequencer/id1453137215) | 4.5 (104) | $9.99 | Music |
| [Groove Rider 2](https://appshunter.io/ios/app/groove-rider-2/id6480135731) | 4.9 (120) | $34.99 | Music |

## More apps by Laurent Colson

- [MusicMath](https://appshunter.io/ios/app/musicmath/id381525762)
- [ChordPolyPad](https://appshunter.io/ios/app/chordpolypad/id694599930)
- [QuantiChord](https://appshunter.io/ios/app/quantichord/id1439713799)

All apps by Laurent Colson: https://appshunter.io/developer/381525765

## Related topics

[prism midi sequencer](https://appshunter.io/ios/topics/prism-midi-sequencer) · [laurent colson](https://appshunter.io/ios/topics/laurent-colson)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-27.*