Comparison

StepPolyArp vs Mozaic Plugin Workshop

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

StepPolyArp

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
Read full description

"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)

About

Mozaic Plugin Workshop

Design and build your own custom MIDI plugins for music production. This tool offers a simple yet powerful scripting language and pre-built components to create filters, sequencers, and generative music tools. It integrates with AUv3 MIDI hosts for seamless workflow.

Highlights
  • Custom MIDI plugin creation
  • Easy-to-learn scripting language
  • Generative music tools
  • MIDI filters and sequencers
  • AUv3 support
  • Tilt sensor integration
  • Built-in script editor
Features
Currently charting
Read full description

Create your own MIDI plugins: MIDI filters, generative music tools, basic sequencers, MIDI control panels, chaos experiments... Let your imagination take you places. Mozaic runs inside your favorite AU MIDI host, and gives you practical building blocks such as LFOs, pre-fab GUI layouts, musical scales, AUv3 support (with AU Parameters, transport events, tempo syncing, etc.), random generators and a super-simple yet powerful script language. Mozaic even offers quick access to your device’s Tilt Sensors for expressive interaction concepts! The Mozaic Script language is designed from the ground up to be the easiest and most flexible MIDI language on iOS. A language by creatives, for creatives. You’ll only need to write a few lines of script to achieve impressive things - or to create that uber-specific thing that was missing from your MIDI setup. Check out the Programming Manual on Ruismaker.com to learn about the script language and to get inspiration for awesome scripts of your own. Mozaic comes with a sizable collection of tutorials and pre-made scripts which you can use out of the box, or which can be a starting point for your own plugin adventures. Features in a nutshell: - Easy to learn Mozaic Script language: easy to learn, easy to read - Sample-accurate-everything: the tightest MIDI timing possible - Built-in script editor with code-completion, syntax hints, etc. - 5 immediately usable GUI layouts, with knobs, sliders, pads, etc. - In-depth, helpful programming manual available on Ruismaker.com - Easy access to LFOs, scales, MIDI I/O, AU parameters, timers - Supports Sysex, with built-in checksum calculations - AUv3; so you'll get multi-instance, state-saving, tempo sync and resource efficiency out of the box Mozaic opens up the world of creative MIDI plugins to anyone willing to put in a few hours and a hot beverage or two. Practical notes: - Mozaic requires a plugin host with support for AUv3 MIDI plugins (AUM, ApeMatrix, Cubasis, Auria, Audiobus 3, etc.) - The standalone mode of Mozaic lets you edit, test and export projects, but for MIDI connections you need to run it inside an AUv3 MIDI host - MIDI is not sound; Mozaic on its own does not make noise... so bring your own synths, drum machines and other instruments! - AUv3 MIDI requires iOS11 or higher

Screenshots

StepPolyArp3 screens
Mozaic Plugin Workshop4 screens

Verdict

The call

The clearest difference is price: Mozaic Plugin Workshop at $1.99 against StepPolyArp's $19.99. Mozaic Plugin Workshop also leads on in-app purchases (none vs 2) and rating (5.0 vs 4.8). On review sentiment, ratings volume, update cadence and ads there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

StepPolyArp costs $19.99 and Mozaic Plugin Workshop $1.99 up front. StepPolyArp sells 2 one-off in-app purchases. Mozaic Plugin Workshop asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Mozaic Plugin Workshop holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 48 and 81 respectively. Written reviews point the same way: 87% of StepPolyArp's written reviews are positive against 95% of Mozaic Plugin Workshop's.

UpkeepUpdate frequency

StepPolyArp ships an update every 2 months, Mozaic Plugin Workshop every 3 months. The most recent releases landed on September 22, 2026 and September 19, 2026 respectively.

Scorecard5 real differences · 6 level
StepPolyArp versus Mozaic Plugin Workshop: the parameters behind the verdict, then further details
ParameterStepPolyArpMozaic Plugin Workshop
Price$19.99$1.99 — better
Rating4.8 (48 ratings)5.0 (81 ratings) — better
Positive reviews86.7% of reviews94.6% of reviews — better
Number of ratings4881 — better
Update frequencyEvery 2 months — betterEvery 3 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaidPaid
Best chart rank—#182 — better
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad, iPod
Requires iOS15.012.4 — better
Further details — not scored
Size38 MB3 MB
Age rating4+4+
DeveloperLaurent ColsonBram Bos

Customer experience

StepPolyArp

All ratings48 ratings
Positive97.9%
Neutral0.0%
Negative2.1%
Written reviews45 reviews
Positive86.7%
Neutral6.7%
Negative6.7%

Mozaic Plugin Workshop

All ratings81 ratings
Positive98.8%
Neutral1.2%
Negative0.0%
Written reviews37 reviews
Positive94.6%
Neutral2.7%
Negative2.7%

In-app purchases

2 purchases

StepPolyArp

One-time2
  • Dance Horizons$4.99
  • Analog Sequence$4.99
None

Mozaic Plugin Workshop

No in-app purchases

Questions

Is StepPolyArp free?
StepPolyArp costs $19.99, and also offers in-app purchases.
Is Mozaic Plugin Workshop free?
Mozaic Plugin Workshop costs $1.99, with no in-app purchases.
Which has better reviews, StepPolyArp or Mozaic Plugin Workshop?
Mozaic Plugin Workshop is rated higher. StepPolyArp averages 4.8 out of 5 from 48 ratings, while Mozaic Plugin Workshop averages 5.0 from 81 ratings.
Do StepPolyArp or Mozaic Plugin Workshop have ads?
Neither StepPolyArp nor Mozaic Plugin Workshop shows ads.
Which is updated more often, StepPolyArp or Mozaic Plugin Workshop?
StepPolyArp ships an update every 2 months, and Mozaic Plugin Workshop every 3 months. Most recently, StepPolyArp was updated on September 22, 2026 and Mozaic Plugin Workshop on September 19, 2026.

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