Comparison

Midiflow Randomizer (Audiobus) vs MIDI FX PRO

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

Head to head
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.

About

MIDI FX PRO

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
Read full description

Buy once and get the iOS and Mac apps (with Family Sharing) This is the Unlocked Version of MIDI FX. You can buy this version instead of unlocking the free one through IAP Control your MIDI signals and process them in any combination of ways: Harmonize, Transpose, Arpeggiate, etc... Or use the Sequencer to play any external or virtual synth. Use a MIDI interface to unlock the power of the app to control multiple synths with one keyboard, play one note and generate chords, basslines, etc... Use the delay/looper or filter notes based on velocity or other parameters to send to different synths/effects. A MIDI workstation in your pocket (or your iPad/Mac) You can also use some internal instruments (drums sampler, piano or synth) if you are away from your MIDI gear, and sequence whole songs inside the app, or use other synth apps as input/output for MIDI FX. Your imagination is the limit!

Screenshots

Midiflow Randomizer (Audiobus)4 screens
MIDI FX PRO1 screens

Verdict

The call

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.

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

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
Midiflow Randomizer (Audiobus) versus MIDI FX PRO: the parameters behind the verdict, then further details
ParameterMidiflow Randomizer (Audiobus)MIDI FX PRO
Price$1.99 — better$9.99
Rating3.0 (4 ratings)5.0 (3 ratings) — better
Positive reviews50.0% of reviews50.0% of reviews
Number of ratings4 — better3
Update frequencyEvery 11 monthsMonthly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac — better
Requires iOS10.2 — better14.7
Further details — not scored
Size5 MB263 MB
Age rating4+4+
DeveloperJohannes DoerrJorge Arroyo

Customer experience

Midiflow Randomizer (Audiobus)

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

MIDI FX PRO

All ratings4 ratings
Positive75.0%
Neutral0.0%
Negative25.0%
Written reviews4 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

None

Midiflow Randomizer (Audiobus)

No in-app purchases

None

MIDI FX PRO

No in-app purchases

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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