# StepPolyArp vs AU3FX

The clearest difference is price: AU3FX at $4.99 against StepPolyArp's $19.99. AU3FX also leads on in-app purchases (none vs 2) and review sentiment (100% vs 87%). StepPolyArp's advantage is rating (4.8 vs 4.6) and ratings volume (48 vs 10). On ads, monetization model and device support there is nothing between them.

StepPolyArp costs $19.99 and AU3FX $4.99 up front. StepPolyArp sells 2 one-off in-app purchases. AU3FX asks for nothing beyond the download.

StepPolyArp holds the better App Store score, 4.8 against 4.6. Both are backed by a comparable volume of ratings — 48 and 10 respectively. Written reviews complicate that: 87% of StepPolyArp's written reviews are positive against 100% of AU3FX's, so the app with the better star average is not the one people write more warmly about.

## The numbers

| Metric | StepPolyArp | AU3FX |
| --- | --- | --- |
| Price | $19.99 | **$4.99** |
| Rating | **[4.8 (48 ratings)](https://appshunter.io/ios/app/steppolyarp/id1361313588/reviews)** | [4.6 (10 ratings)](https://appshunter.io/ios/app/au3fxpeakq/id1597768353/reviews) |
| Number of ratings | **48** | 10 |
| Positive reviews | 87.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | — |
| Monetization | Paid | Paid |
| Size | 38 MB | 2 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Laurent Colson](https://appshunter.io/developer/381525765) | [Kymatica AB](https://appshunter.io/developer/522046659) |

## What reviewers say

### StepPolyArp

[App page](https://appshunter.io/ios/app/steppolyarp/id1361313588)

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:** Vision Pro support

**In-app purchases (2)**

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


### AU3FX

[App page](https://appshunter.io/ios/app/au3fxpeakq/id1597768353)

A powerful 4-band parametric stereo equalizer AUv3 plugin for iOS. It offers detailed frequency control, real-time spectrum analysis, and customizable presets for subtle enhancements or aggressive sound shaping. Load it within compatible music apps to enhance your audio.

**Highlights:** 4-band parametric stereo equalizer, High quality 32-bit DSP engine, Interactive frequency response curve, Real-time FFT spectrum analyzer, Bundled presets and user preset saving, Multiple instances and external control

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is StepPolyArp free?

StepPolyArp costs $19.99, and also offers in-app purchases.

### Is AU3FX free?

AU3FX costs $4.99, with no in-app purchases.

### Which has better reviews, StepPolyArp or AU3FX?

StepPolyArp is rated higher. StepPolyArp averages 4.8 out of 5 from 48 ratings, while AU3FX averages 4.6 from 10 ratings.

### Do StepPolyArp or AU3FX have ads?

Neither StepPolyArp nor AU3FX shows ads.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*