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.
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
Read full descriptionHide 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.
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.
- MIDI signal processing
- Harmonize, Transpose, Arpeggiate
- Sequencer for synths
- Delay/looper
- Internal instruments (drums, piano, synth)
- Filter notes by velocity
Read full descriptionHide 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
Verdict
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
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.
| Parameter | Midiflow Randomizer (Audiobus) | MIDI FX PRO |
|---|---|---|
| Price | $1.99 — better | $9.99 |
| Rating | 3.0 (4 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 50.0% of reviews | 50.0% of reviews |
| Number of ratings | 4 — better | 3 |
| Update frequency | Every 11 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 10.2 — better | 14.7 |
| Further details — not scored | ||
| Size | 5 MB | 263 MB |
| Age rating | 4+ | 4+ |
| Developer | Johannes Doerr | Jorge Arroyo |
Customer experience
Midiflow Randomizer (Audiobus)
MIDI FX PRO
In-app purchases
Midiflow Randomizer (Audiobus)
No in-app purchases
MIDI FX PRO
No in-app purchases
Questions
Is Midiflow Randomizer (Audiobus) free?
Is MIDI FX PRO free?
Which has better reviews, Midiflow Randomizer (Audiobus) or MIDI FX PRO?
Do Midiflow Randomizer (Audiobus) or MIDI FX PRO have ads?
Which is updated more often, Midiflow Randomizer (Audiobus) or MIDI FX PRO?
Other comparisons















