# GrainProc vs Midiflow Randomizer (Audiobus)

The clearest difference is rating: GrainProc at 4.2 against Midiflow Randomizer (Audiobus)'s 3.0. GrainProc also leads on update cadence (every 2 months vs every 11 months) and review sentiment (60% vs 50%). Midiflow Randomizer (Audiobus)'s advantage is price ($1.99 vs $2.99) and iOS requirement (10.2 vs 16.0). On ads, in-app purchases, monetization model and device support there is nothing between them.

GrainProc costs $2.99 and Midiflow Randomizer (Audiobus) $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

GrainProc holds the better App Store score, 4.2 against 3.0. Both are backed by a comparable volume of ratings — 18 and 4 respectively. Written reviews point the same way: 60% of GrainProc's written reviews are positive against 50% of Midiflow Randomizer (Audiobus)'s.

GrainProc ships an update every 2 months, Midiflow Randomizer (Audiobus) every 11 months. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | GrainProc | Midiflow Randomizer (Audiobus) |
| --- | --- | --- |
| Price | $2.99 | **$1.99** |
| Rating | **[4.2 (18 ratings)](https://appshunter.io/ios/app/grainproc-granular-synthesis/id572380905/reviews)** | [3.0 (4 ratings)](https://appshunter.io/ios/app/midiflow-randomizer-audiobus/id1107244758/reviews) |
| Number of ratings | **18** | 4 |
| Positive reviews | **60.0% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 11 months |
| Monetization | Paid | Paid |
| Size | 6 MB | 5 MB |
| Requires iOS | 16.0 | **10.2** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Mayank Sanganeria](https://appshunter.io/developer/527550366) | [Johannes Doerr](https://appshunter.io/developer/622204117) |

## What reviewers say

### GrainProc

[App page](https://appshunter.io/ios/app/grainproc-granular-synthesis/id572380905)

Create unique sounds and musical textures in real-time by processing external audio. This app features two parallel granular engines for layering sounds, offering a versatile tool for musicians and sound designers.

**Highlights:** Real-time granular synthesis, Two parallel grain engines, AudioBus input support, Waveform sound source manipulation, Control over volume, feedback, and density, Visual level monitoring

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is GrainProc free?

GrainProc costs $2.99, with no in-app purchases.

### Is Midiflow Randomizer (Audiobus) free?

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

### Which has better reviews, GrainProc or Midiflow Randomizer (Audiobus)?

GrainProc is rated higher. GrainProc averages 4.2 out of 5 from 18 ratings, while Midiflow Randomizer (Audiobus) averages 3.0 from 4 ratings.

### Do GrainProc or Midiflow Randomizer (Audiobus) have ads?

Neither GrainProc nor Midiflow Randomizer (Audiobus) shows ads.

### Which is updated more often, GrainProc or Midiflow Randomizer (Audiobus)?

GrainProc ships an update every 2 months, and Midiflow Randomizer (Audiobus) every 11 months. Most recently, GrainProc was updated on October 23, 2026 and Midiflow Randomizer (Audiobus) on October 24, 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.*