Midiflow Randomizer (Audiobus) vs Nulltrack
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
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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.
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.
- 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
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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
Verdict
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
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.
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.
| Parameter | Midiflow Randomizer (Audiobus) | Nulltrack |
|---|---|---|
| Price | $1.99 — better | $7.99 |
| Rating | 3.0 (4 ratings) — better | — |
| Positive reviews | 50.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 4 — better | — |
| Update frequency | Every 11 months | Every 9 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 10.2 — better | 17.0 |
| Further details — not scored | ||
| Size | 5 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | Johannes Doerr | DECTET LLC |
Customer experience
Midiflow Randomizer (Audiobus)
Nulltrack
In-app purchases
Midiflow Randomizer (Audiobus)
No in-app purchases
Nulltrack
No in-app purchases
Questions
Is Midiflow Randomizer (Audiobus) free?
Is Nulltrack free?
Do Midiflow Randomizer (Audiobus) or Nulltrack have ads?
Which is updated more often, Midiflow Randomizer (Audiobus) or Nulltrack?
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