Comparison

Impaktor vs StepPolyArp

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

Head to head
About

Impaktor

This app transforms any surface into a playable percussion instrument using your device's microphone. It offers a vast sonic palette with advanced sound modules and synthesis types, allowing for a wide range of acoustic, electronic, and industrial tones. Enjoy a realistic virtual drumming experience with low latency and a 6-track recorder.

Highlights
  • Surface-to-percussion instrument transformation
  • Advanced sound module simulation
  • Semi-modular synthesis architecture
  • Physical modeling, FM, and noise shaping synthesis
  • 6-track audio recorder with 3D panning
  • Ultra-low latency performance
Features
Read full description

* "Without doubt the most powerful and genuinely useful percussion app on the App Store right now" Computer Music * Reached the #1 paid music app in 5 countries * SonicTouch (www.sonicstate.com) gold award Impaktor is a drum synthesizer with a vast sonic palette, that turns any surface into a playable percussion instrument. You just slap your desk like you would a real drum. The real acoustical impulses from the built-in microphone are used as an excitation source for advanced sound modules that simulates behavior of membranes, cymbals, metallophones or strings. This makes Impaktor a highly responsive and expressive instrument. With semi-modular architecture and several types of synthesis, Impaktor can produce a wide range of tones, from acoustic, like Tabla, Djembe, Marimba, Cymbals, Metal bars to electronic or industrial sounds. We strongly recommend using the app with wired headphones to avoid acoustic feedback and ensure ultra-low latency. (USB-C to 3.5 mm Headphone Jack Adapter, USB-C headphones or an audio interface). You can use the Impaktor app with a contact microphone or analog drum pad to achieve isolated and sensitive input, reducing ambient noise and enhancing trigger accuracy. Enjoy the most realistic virtual drumming experience available for mobile devices! SYNTHESIZER - Synthesis: physical modeling, frequency modulation, noise shaping - Semi-modular architecture; 2 modules with configurable routing - 2 modulation sources: velocity and lfo-envelope. Almost every parameter can be modulated - Multimode filter, harmonic exciter and several types of amplifiers - Over 90 presets available, more coming soon - No samples used - Ultra low latency  RECORDER - 6 tracks audio recorder - True 3d panning - Auto-quantization with configurable time-signature - Reverb and Delay effects - Audio-copy and wave export

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)

Screenshots

Impaktor2 screens
StepPolyArp3 screens

Verdict

The call

The clearest difference is price: Impaktor at $6.99 against StepPolyArp's $19.99. Impaktor also leads on in-app purchases (none vs 2). StepPolyArp's advantage is rating (4.8 vs 3.7) and update cadence (every 2 months vs every 12 months). On ratings volume, ads, monetization model and device support 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

Impaktor costs $6.99 and StepPolyArp $19.99 up front. StepPolyArp sells 2 one-off in-app purchases. Impaktor asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

StepPolyArp holds the better App Store score, 4.8 against 3.7. Both are backed by a comparable volume of ratings — 53 and 48 respectively. Written reviews point the same way: 79% of Impaktor's written reviews are positive against 87% of StepPolyArp's.

UpkeepUpdate frequency

Impaktor ships an update every 12 months, StepPolyArp every 2 months. The most recent releases landed on October 16, 2026 and October 15, 2026 respectively.

Scorecard5 real differences · 5 level
Impaktor versus StepPolyArp: the parameters behind the verdict, then further details
ParameterImpaktorStepPolyArp
Price$6.99 — better$19.99
Rating3.7 (53 ratings)4.8 (48 ratings) — better
Positive reviews78.9% of reviews87.0% of reviews — better
Number of ratings53 — better48
Update frequencyEvery 12 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac — better
Requires iOS15.615.0 — better
Further details — not scored
Size17 MB38 MB
Age rating4+4+
DeveloperBeepStreetLaurent Colson

Customer experience

Impaktor

All ratings53 ratings
Positive66.0%
Neutral7.5%
Negative26.4%
Written reviews242 reviews
Positive78.9%
Neutral9.5%
Negative11.6%

StepPolyArp

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

Bugs and requests

Impaktor

Reported bugs

5 issues
  • Crashes with Inter-App Audio
  • Issues with WAV exports
  • Latency problems on certain devices
  • Compatibility issues with iOS updates
  • Unreliable saving functionality

Requested features

6 requests
  • MIDI support
  • Audio import functionality
  • Ableton Link sync
  • More quantization options
  • Multitrack export
Show 1 more
  • Landscape mode for iPad

StepPolyArp

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Impaktor

No in-app purchases

2 purchases

StepPolyArp

One-time2
  • Dance Horizons$4.99
  • Analog Sequence$4.99

Questions

Is Impaktor free?
Impaktor costs $6.99, with no in-app purchases.
Is StepPolyArp free?
StepPolyArp costs $19.99, and also offers in-app purchases.
Which has better reviews, Impaktor or StepPolyArp?
StepPolyArp is rated higher. Impaktor averages 3.7 out of 5 from 53 ratings, while StepPolyArp averages 4.8 from 48 ratings.
Do Impaktor or StepPolyArp have ads?
Neither Impaktor nor StepPolyArp shows ads.
Which is updated more often, Impaktor or StepPolyArp?
Impaktor ships an update every 12 months, and StepPolyArp every 2 months. Most recently, Impaktor was updated on October 16, 2026 and StepPolyArp on October 15, 2026.

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