GrainProc vs Midiflow Randomizer (Audiobus)
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
GrainProc
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.
- Real-time granular synthesis
- Two parallel grain engines
- AudioBus input support
- Waveform sound source manipulation
- Control over volume, feedback, and density
- Visual level monitoring
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GrainProc is a real-time granular synthesizer with which you can create new sounds and musical textures by affecting your voice, your instrument, or any input from AudioBus. 2 grain engines run in parallel, allowing you to layer two sounds and create rich textures, even as a solo performer! Features: • 2 Granular synthesizers running in parallel • Waveform representation of the sound allowing you to touch where you want the sound source to be • Sliders to control dry volume, wet volume, feedback level, and grain density • Visual level monitors of the dry, wet and feedback levels • Simple enough to be used with your feet! We discourage using your device with your feet, though it has been used that way for public performances!
Midiflow Randomizer (Audiobus)
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.
- Randomize notes
- Randomize note velocities
- Randomize timing
- Specify variation range
- Use multiple instances
- Requires Audiobus 3
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Whether you want to add a human touch to note sequences or seek inspiration, this MIDI effect app for Audiobus 3 is a simple but effective tool for you. Randomize notes, note velocities, and timing just by specifying a desired range of variations. With the help of Midiflow Scales, you can keep your randomized notes in harmony. + Randomize notes + Randomize note velocities + Randomize timing + Specify an amount of variation for each type + Use multiple instances of this effect in Audiobus NOTE: This app requires Audiobus 3. Insert it into one or more MIDI effect ports to affect the data going through the respective pipelines.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | GrainProc | Midiflow Randomizer (Audiobus) |
|---|---|---|
| Price | $2.99 | $1.99 — better |
| Rating | 4.2 (18 ratings) — better | 3.0 (4 ratings) |
| Positive reviews | 60.0% of reviews — better | 50.0% of reviews |
| Number of ratings | 18 — better | 4 |
| Update frequency | Every 2 months — better | Every 11 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 10.2 — better |
| Further details — not scored | ||
| Size | 6 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Mayank Sanganeria | Johannes Doerr |
Customer experience
GrainProc
Midiflow Randomizer (Audiobus)
In-app purchases
GrainProc
No in-app purchases
Midiflow Randomizer (Audiobus)
No in-app purchases
Questions
Is GrainProc free?
Is Midiflow Randomizer (Audiobus) free?
Which has better reviews, GrainProc or Midiflow Randomizer (Audiobus)?
Do GrainProc or Midiflow Randomizer (Audiobus) have ads?
Which is updated more often, GrainProc or Midiflow Randomizer (Audiobus)?
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