Comparison

StepPolyArp vs BLEASS Arpeggiator

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

BLEASS Arpeggiator

This app offers advanced arpeggiation capabilities for musicians, going beyond traditional patterns with polyrhythms and polyphony. Its intuitive interface encourages on-the-fly experimentation, enhanced by performance controllers, LFOs, and a motion sequencer. It also includes a built-in FM synth for sound generation or can be used with other instruments.

Highlights
  • Advanced arpeggiation patterns
  • Polyphony and polyrhythms
  • Hands-on creative interface
  • XY pads and LFOs
  • Motion Sequencer
  • Built-in FM synth
  • MIDI output for external synths
Read full description

A new and unique Arpeggiator by BLEASS & Canblaster. Use it as a MIDI FX to control any synth or as an AUv3 Instrument thanks to its built-in FM Synth! BLEASS Arpeggiator takes the inspirationally melodic power of a classic synth arpeggiator and supercharges it with modern features demanded by today’s musicians. Developed in collaboration with top French producer Canblaster, BLEASS Arpeggiator’s capabilities extend far beyond the clichéd up-and-down monophonic patterns of an old-school synth arpeggiator, with polyrhythms, polyphony, and a large collection of highly configurable arpeggio patterns built in. The focus of BLEASS Arpeggiator is creativity and experimentation. The plugin’s hands-on user interface is as intuitive and spontaneous to use as a classic subtractive synth, so varying and adapting arpeggios on-the-fly is an easy, fun and organic experience. The plugin recognises incoming performance controllers, and includes a pair of XY pads, a pair of advanced LFOs and BLEASS’ signature Motion Sequencer. These can modulate the arpeggiator’s parameters, unlocking a deep level of creativity that is simply not available from modern step-sequencer-style arpeggiators. BLEASS Arpeggiator also offers a built-in sound generator. This is a cut-down yet great-sounding FM synth that’s perfect for creating bright, sweet and punchy sounds that can work well with an arpeggio line. You can of course use BLEASS Arpeggiator with any other synth too, with each instance of the plugin creating its own MIDI source that can be routed to any instrument within your project. More information, technical specifications and tutorials available on https://www.bleass.com/arpeggiator BLEASS Arpeggiator is available as an AUv3 plugin or standalone App. BLEASS Arpeggiator is also available for Windows, and macOS.

Screenshots

StepPolyArp3 screens
BLEASS Arpeggiator4 screens

Verdict

The call

The clearest difference is in-app purchases: BLEASS Arpeggiator at none against StepPolyArp's 2. BLEASS Arpeggiator also leads on price ($14.99 vs $19.99). StepPolyArp's advantage is update cadence (every 2 months vs every 6 months) and review sentiment (87% vs 75%). On rating, ratings volume, ads and monetization model 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 BLEASS Arpeggiator $14.99 up front. StepPolyArp sells 2 one-off in-app purchases. BLEASS Arpeggiator asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.8 for StepPolyArp against 4.8 for BLEASS Arpeggiator. Both are backed by a comparable volume of ratings — 48 and 54 respectively. Written reviews are what separate them: 87% of StepPolyArp's written reviews are positive against 75% of BLEASS Arpeggiator's.

UpkeepUpdate frequency

StepPolyArp ships an update every 2 months, BLEASS Arpeggiator every 6 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

Scorecard4 real differences · 6 level
StepPolyArp versus BLEASS Arpeggiator: the parameters behind the verdict, then further details
ParameterStepPolyArpBLEASS Arpeggiator
Price$19.99$14.99 — better
Rating4.8 (48 ratings)4.8 (54 ratings) — better
Positive reviews87.0% of reviews — better75.0% of reviews
Number of ratings4854 — better
Update frequencyEvery 2 months — betterEvery 6 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaidPaid
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad, iPod
Requires iOS15.0 — better15.6
Further details — not scored
Size38 MB20 MB
Age rating4+4+
DeveloperLaurent ColsonBLEASS

Customer experience

StepPolyArp

All ratings48 ratings
Positive97.9%
Neutral0.0%
Negative2.1%
Written reviews46 reviews
Positive87.0%
Neutral6.5%
Negative6.5%

BLEASS Arpeggiator

All ratings54 ratings
Positive96.3%
Neutral0.0%
Negative3.7%
Written reviews12 reviews
Positive75.0%
Neutral0.0%
Negative25.0%

In-app purchases

2 purchases

StepPolyArp

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

BLEASS Arpeggiator

No in-app purchases

Questions

Is StepPolyArp free?
StepPolyArp costs $19.99, and also offers in-app purchases.
Is BLEASS Arpeggiator free?
BLEASS Arpeggiator costs $14.99, with no in-app purchases.
Which has better reviews, StepPolyArp or BLEASS Arpeggiator?
BLEASS Arpeggiator is rated higher. StepPolyArp averages 4.8 out of 5 from 48 ratings, while BLEASS Arpeggiator averages 4.8 from 54 ratings.
Do StepPolyArp or BLEASS Arpeggiator have ads?
Neither StepPolyArp nor BLEASS Arpeggiator shows ads.
Which is updated more often, StepPolyArp or BLEASS Arpeggiator?
StepPolyArp ships an update every 2 months, and BLEASS Arpeggiator every 6 months. Most recently, StepPolyArp was updated on November 2, 2026 and BLEASS Arpeggiator on November 3, 2026.

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