# Midiflow Randomizer (Audiobus) vs MIDI FX PRO

The clearest difference is rating: MIDI FX PRO at 5.0 against Midiflow Randomizer (Audiobus)'s 3.0. MIDI FX PRO also leads on update cadence (monthly vs every 11 months). Midiflow Randomizer (Audiobus)'s advantage is price ($1.99 vs $9.99) and iOS requirement (10.2 vs 14.7). On review sentiment, ratings volume, ads and in-app purchases there is nothing between them.

Midiflow Randomizer (Audiobus) costs $1.99 and MIDI FX PRO $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

MIDI FX PRO holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 4 and 3 respectively. Written reviews split almost evenly too, at 50% and 50% positive.

Midiflow Randomizer (Audiobus) ships an update every 11 months, MIDI FX PRO monthly. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Midiflow Randomizer (Audiobus) | MIDI FX PRO |
| --- | --- | --- |
| Price | **$1.99** | $9.99 |
| Rating | [3.0 (4 ratings)](https://appshunter.io/ios/app/midiflow-randomizer-audiobus/id1107244758/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/midi-fx-pro/id6444039855/reviews)** |
| Number of ratings | **4** | 3 |
| Positive reviews | 50.0% of reviews | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Monthly** |
| Monetization | Paid | Paid |
| Size | 5 MB | 263 MB |
| Requires iOS | **10.2** | 14.7 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Johannes Doerr](https://appshunter.io/developer/622204117) | [Jorge Arroyo](https://appshunter.io/developer/548989572) |

## What reviewers say

### Midiflow Randomizer (Audiobus)

[App page](https://appshunter.io/ios/app/midiflow-randomizer-audiobus/id1107244758)

This MIDI effect app generates random variations in notes, velocities, and timing for musical sequences. It allows users to specify the range of randomization and can be used with other MIDI tools for harmonious results. Requires Audiobus 3.

**Highlights:** Randomize notes, Randomize note velocities, Randomize timing, Specify variation range, Use multiple instances, Requires Audiobus 3

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### MIDI FX PRO

[App page](https://appshunter.io/ios/app/midi-fx-pro/id6444039855)

This app is a powerful MIDI workstation for iOS and Mac, allowing users to control and process MIDI signals. It offers features like harmonization, transposition, arpeggiation, and sequencing for external or virtual synths. It also includes internal instruments and effects for mobile music creation.

**Highlights:** MIDI signal processing, Harmonize, Transpose, Arpeggiate, Sequencer for synths, Delay/looper, Internal instruments (drums, piano, synth), Filter notes by velocity

**In-app purchases:** none


## Frequently asked questions

### Is Midiflow Randomizer (Audiobus) free?

Midiflow Randomizer (Audiobus) costs $1.99, with no in-app purchases.

### Is MIDI FX PRO free?

MIDI FX PRO costs $9.99, with no in-app purchases.

### Which has better reviews, Midiflow Randomizer (Audiobus) or MIDI FX PRO?

MIDI FX PRO is rated higher. Midiflow Randomizer (Audiobus) averages 3.0 out of 5 from 4 ratings, while MIDI FX PRO averages 5.0 from 3 ratings.

### Do Midiflow Randomizer (Audiobus) or MIDI FX PRO have ads?

Neither Midiflow Randomizer (Audiobus) nor MIDI FX PRO shows ads.

### Which is updated more often, Midiflow Randomizer (Audiobus) or MIDI FX PRO?

Midiflow Randomizer (Audiobus) ships an update every 11 months, and MIDI FX PRO monthly. Most recently, Midiflow Randomizer (Audiobus) was updated on November 2, 2026 and MIDI FX PRO on November 3, 2026.

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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.*