Comparison

Midiflow Randomizer (Audiobus) vs Nulltrack

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

Nulltrack

This mobile digital audio workstation offers a unique, grid-based approach to music creation, inspired by classic trackers. It includes built-in synths, a sampler, extensive modulation options, and mixing tools.

Highlights
  • AUv3 plugin support
  • Two built-in synthesizers
  • Built-in sampler
  • Extensive modulation options
  • Mixing features with track faders
  • Groove tables for swing/playback
  • Pattern locking to scales
Read full description

Launch price $4.99 — rises to $7.99 four weeks after release. Get it early! Nulltrack! It's null when you start and a track when you finish! Nulltrack is a tracker and digital audio workstation app for your phone. A different way to make music inspired by LSDJ and the Dirtywave M8. Features: AUv3 plugin support - bring your external synths and effects into your track! Two built-in synthesizers -- A versatile two-oscillator Basic Synth and a feature-rich Bass Synth. A built-in sampler -- record your own samples with your phone's microphone, load your own, or use the built-in samples, set loop points, slice, reverse, etc. Modulation -- Modulate nearly anything with LFOs, AHD / ADSR / drum envelopes, velocity, randomness, and key tracking, filter, panning, and more. Mixing Features -- track faders with solo and mute, 13 built-in effects, sidechain compression Sends -- share effects between tracks Customize your swing/playback with groove tables! Lock your patterns to a built-in scale! ...and much more! New to trackers? They're a fast, grid-based way to write music. Try it out! No ads, no subscription, no in-app-purchases, and no account needed.

Screenshots

Midiflow Randomizer (Audiobus)4 screens
Nulltrack4 screens

Verdict

The call

The clearest difference is review sentiment: Nulltrack at 100% against Midiflow Randomizer (Audiobus)'s 50%. Nulltrack also leads on update cadence (every 9 days vs every 11 months). Midiflow Randomizer (Audiobus)'s advantage is price ($1.99 vs $7.99) and device support (3 vs 1). On ads, in-app purchases and monetization model 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 Nulltrack $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Midiflow Randomizer (Audiobus) ships an update every 11 months, Nulltrack every 9 days. The most recent releases landed on September 25, 2026 and October 2, 2026 respectively.

Scorecard5 real differences · 5 level
Midiflow Randomizer (Audiobus) versus Nulltrack: the parameters behind the verdict, then further details
ParameterMidiflow Randomizer (Audiobus)Nulltrack
Price$1.99 — better$7.99
Rating3.0 (4 ratings) — better—
Positive reviews50.0% of reviews100.0% of reviews — better
Number of ratings4 — better—
Update frequencyEvery 11 monthsEvery 9 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS10.2 — better17.0
Further details — not scored
Size5 MB17 MB
Age rating4+4+
DeveloperJohannes DoerrDECTET LLC

Customer experience

Midiflow Randomizer (Audiobus)

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

Nulltrack

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Midiflow Randomizer (Audiobus)

No in-app purchases

None

Nulltrack

No in-app purchases

Questions

Is Midiflow Randomizer (Audiobus) free?
Midiflow Randomizer (Audiobus) costs $1.99, with no in-app purchases.
Is Nulltrack free?
Nulltrack costs $7.99, with no in-app purchases.
Do Midiflow Randomizer (Audiobus) or Nulltrack have ads?
Neither Midiflow Randomizer (Audiobus) nor Nulltrack shows ads.
Which is updated more often, Midiflow Randomizer (Audiobus) or Nulltrack?
Midiflow Randomizer (Audiobus) ships an update every 11 months, and Nulltrack every 9 days. Most recently, Midiflow Randomizer (Audiobus) was updated on September 25, 2026 and Nulltrack on October 2, 2026.

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