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StepPolyArp

StepPolyArp

Step Arpeggiator/Sequencer

48 ratings
44 reviews
#169 in paid Music
🎵 Music
$19.99
In-App Purchases

Details

  • Released
  • Updated
  • July 25, 2018
  • July 15, 2026

Features

Developer

Laurent Colson
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StepPolyArp screenshot #1 for iPhone
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StepPolyArp screenshot #3 for iPhone
iphone
ipad
🧾$4.99
In-App Purchase↘︎
📉no. 169
Charts↘︎
⭐44
Reviews↘︎
📝1+ tags
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🔄6+ apps
Alternatives↘︎
❓5 answered
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📦~ in 2 months
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About

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.

✓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
Show original description

What's New in StepPolyArp

6.0

July 15, 2026

• 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

More
2

In-App Purchases

$4.99

Dance Horizons

45 presets for Dance, Trance and electronic music

Charts

Top Paid

📉 169-28

Music

This app dropped -28 positions in Music chart.

Last updated on July 28, 2026.

User reviews

Most RecentHighest RatedLowest Rated

very useful application

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
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Ludwig089Ludwig089

Keep coming back

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
preemptionpreemption

The best sequencer

Le meilleur séquenceur pour moi
AramisQuebecAramisQuebec

Masterful

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.
grape_ape_grape_apegrape_ape_grape_ape

Really exceptional app.

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!
Show more
(In)Sitze(In)Sitze
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FAQ

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.