Comparison

GrainProc vs Midiflow Randomizer (Audiobus)

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

Head to head
About

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.

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
Read full description

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!

About

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.

Highlights
  • Randomize notes
  • Randomize note velocities
  • Randomize timing
  • Specify variation range
  • Use multiple instances
  • Requires Audiobus 3
Features
Read full description

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

GrainProc4 screens
Midiflow Randomizer (Audiobus)4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard6 real differences · 4 level
GrainProc versus Midiflow Randomizer (Audiobus): the parameters behind the verdict, then further details
ParameterGrainProcMidiflow Randomizer (Audiobus)
Price$2.99$1.99 — better
Rating4.2 (18 ratings) — better3.0 (4 ratings)
Positive reviews60.0% of reviews — better50.0% of reviews
Number of ratings18 — better4
Update frequencyEvery 2 months — betterEvery 11 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.010.2 — better
Further details — not scored
Size6 MB5 MB
Age rating4+4+
DeveloperMayank SanganeriaJohannes Doerr

Customer experience

GrainProc

All ratings16 ratings
Positive75.0%
Neutral6.3%
Negative18.8%
Written reviews30 reviews
Positive60.0%
Neutral13.3%
Negative26.7%

Midiflow Randomizer (Audiobus)

All ratings4 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews6 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

None

GrainProc

No in-app purchases

None

Midiflow Randomizer (Audiobus)

No in-app purchases

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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