Comparison

Midiflow Randomizer (Audiobus) vs Microtonal Lab

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

Microtonal Lab

Explore music beyond the traditional 12-note scale with this comprehensive microtonal studio. Create custom scales, play a microtonal keyboard, sequence patterns, and perform live with a launchpad. Export your creations as MIDI files for further production.

Highlights
  • Harmonic Galaxy visualizer
  • Microtonal keyboard with custom scales
  • 32-step sequencer with FX
  • Launchpad for live performance
  • Extensive world scale library
  • Multiple tuning systems support
  • MIDI export for DAWs
Features
Read full description

Microtonal Lab is a complete microtonal music studio for iOS. Break free from the 12-note octave and explore the infinite space between the notes. AUv3 PLUGIN Use MicrotonalLab as a plugin inside GarageBand, AUM, Cubasis, Drambo, and any AUv3-compatible host. The full step sequencer, tuning system, and SF2 instruments are available directly in your DAW. Record sequences as MIDI regions with automatic tempo sync. HARMONIC GALAXY Discover musical intervals as a visual universe. Every dot is an interval above the root — its size shows consonance, its color shows its position in the octave, and its number shows the exact distance in cents. Pinch to zoom and new microtones emerge from the depths. Build custom scales by tapping intervals and save them to your library. MICROTONAL KEYBOARD A fully playable keyboard with exact microtonal tuning. Choose from piano, strings, marimba, vibes, bass, pad, flute, or synthesized waveforms. Activate any scale from the library and the keyboard reconfigures to show precisely those notes. Supports glide between notes for expressive playing. STEP SEQUENCER A 16-step sequencer with microtonal note assignment per step, velocity, gate, and swing control. Syncs to the host tempo in AUv3 mode. LAUNCHPAD A grid-based launchpad for live performance. Rows correspond to scale degrees, columns to time — tap to toggle notes and play your patterns in real time. SCALE LIBRARY Browse world scales from dozens of musical traditions, including Arabic maqam, Indian ragas, Persian dastgah, Javanese gamelan, and many more. Preview any scale, then activate it across all views with one tap. TUNING SYSTEMS Switch between 12-TET, 19-TET, 24-TET, 31-TET, and 53-TET. Full access to all scale degrees in the sequencer for every tuning system. MIDI EXPORT Export your sequences to standard MIDI files with full microtonal pitch bend on each channel. Import directly into any DAW for further production. FX Filter (low-pass with cutoff and resonance), reverb (from small room to cathedral), and delay — all controllable via XY pads in real time during playback. Microtonal Lab is built for composers, sound designers, music theorists, and anyone curious about the music that lives between the keys.

Screenshots

Midiflow Randomizer (Audiobus)4 screens
Microtonal Lab4 screens

Verdict

The call

The clearest difference is rating: Midiflow Randomizer (Audiobus) at 3.0 against Microtonal Lab's 1.0. Midiflow Randomizer (Audiobus) also leads on price ($1.99 vs $6.99) and ratings volume (4 vs 1). Microtonal Lab's advantage is update cadence (every 2 months vs every 11 months). 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

Midiflow Randomizer (Audiobus) costs $1.99 and Microtonal Lab $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Midiflow Randomizer (Audiobus) holds the better App Store score, 3.0 against 1.0. Both are backed by a comparable volume of ratings — 4 and 1 respectively.

UpkeepUpdate frequency

Midiflow Randomizer (Audiobus) ships an update every 11 months, Microtonal Lab every 2 months. Both last shipped on October 24, 2026.

Scorecard5 real differences · 5 level
Midiflow Randomizer (Audiobus) versus Microtonal Lab: the parameters behind the verdict, then further details
ParameterMidiflow Randomizer (Audiobus)Microtonal Lab
Price$1.99 — better$6.99
Rating3.0 (4 ratings) — better1.0 (1 ratings)
Positive reviews50.0% of reviews—
Number of ratings4 — better1
Update frequencyEvery 11 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS10.2 — better18.0
Further details — not scored
Size5 MB90 MB
Age rating4+4+
DeveloperJohannes DoerrMartin Adler

Customer experience

Midiflow Randomizer (Audiobus)

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

Microtonal Lab

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

Midiflow Randomizer (Audiobus)

No in-app purchases

None

Microtonal Lab

No in-app purchases

Questions

Is Midiflow Randomizer (Audiobus) free?
Midiflow Randomizer (Audiobus) costs $1.99, with no in-app purchases.
Is Microtonal Lab free?
Microtonal Lab costs $6.99, with no in-app purchases.
Which has better reviews, Midiflow Randomizer (Audiobus) or Microtonal Lab?
Midiflow Randomizer (Audiobus) is rated higher. Midiflow Randomizer (Audiobus) averages 3.0 out of 5 from 4 ratings, while Microtonal Lab averages 1.0 from 1 ratings.
Do Midiflow Randomizer (Audiobus) or Microtonal Lab have ads?
Neither Midiflow Randomizer (Audiobus) nor Microtonal Lab shows ads.
Which is updated more often, Midiflow Randomizer (Audiobus) or Microtonal Lab?
Midiflow Randomizer (Audiobus) ships an update every 11 months, and Microtonal Lab every 2 months. Most recently, Midiflow Randomizer (Audiobus) was updated on October 24, 2026 and Microtonal Lab on October 24, 2026.

Other comparisons