Comparison

Midiflow Randomizer (Audiobus) vs Stellr

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

Stellr

Create deep, ethereal ambiance with a pitch-shifter, dual delays, and reverb. Explore sonic possibilities with 15 presets, randomization, and parameter automation. Enhance your music with a new dimension of sound.

Highlights
  • Pitch shifter with fine-tuning or semitone snap
  • Two independent delays for complex feedback
  • LFO modulation and various reverb types
  • Pre-gain and dry/wet level control
  • Audio Unit Extension, Audiobus, Inter-App Audio support
  • 15 built-in presets with import/export
  • Realtime frequency spectrum visualizer
Features
Read full description

Stellr is a pitch-shifter/delay/reverb sound processor aimed to recreate the classic shimmer effect. It makes deep ethereal ambiance on top of your sound, providing you with a wide variety of sonic possibilities. Add a new dimension to your music. The effect features 20 ready to use presets which can be shared between devices as well as randomize button for endless variations. When loaded as Audio Unit effect, all parameters can be automated via host app. Stellr main features: – Pitch shifter which can be fine-tuned or snapped to semitone – Two separate delays for creating a complex feedback effect – LFO modulation and different types of reverb – Set pre-gain and dry/wet levels – Audio Unit Extension support – 20 built-in presets – Low-pass and High-pass filters – Ability to save and randomize parameters – Import and export of user presets – Realtime frequency spectrum visualizer

Screenshots

Midiflow Randomizer (Audiobus)4 screens
Stellr2 screens

Verdict

The call

The clearest difference is rating: Stellr at 3.4 against Midiflow Randomizer (Audiobus)'s 3.0. Stellr also leads on review sentiment (67% vs 50%). Midiflow Randomizer (Audiobus)'s advantage is update cadence (every 11 months vs every 40 months) and price ($1.99 vs $4.99). On ratings volume, 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 Stellr $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Stellr holds the better App Store score, 3.4 against 3.0. Both are backed by a comparable volume of ratings — 4 and 9 respectively. Written reviews point the same way: 50% of Midiflow Randomizer (Audiobus)'s written reviews are positive against 67% of Stellr's.

UpkeepUpdate frequency

Midiflow Randomizer (Audiobus) ships an update every 11 months, Stellr every 40 months. The most recent releases landed on October 24, 2026 and October 19, 2026 respectively.

Scorecard5 real differences · 5 level
Midiflow Randomizer (Audiobus) versus Stellr: the parameters behind the verdict, then further details
ParameterMidiflow Randomizer (Audiobus)Stellr
Price$1.99 — better$4.99
Rating3.0 (4 ratings)3.4 (9 ratings) — better
Positive reviews50.0% of reviews66.7% of reviews — better
Number of ratings49 — better
Update frequencyEvery 11 months — betterEvery 40 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS10.2 — better12.0
Further details — not scored
Size5 MB26 MB
Age rating4+4+
DeveloperJohannes DoerrBACKPULLVER SOFTWARE LTD OOD

Customer experience

Midiflow Randomizer (Audiobus)

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

Stellr

All ratings9 ratings
Positive55.6%
Neutral11.1%
Negative33.3%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

In-app purchases

None

Midiflow Randomizer (Audiobus)

No in-app purchases

None

Stellr

No in-app purchases

Questions

Is Midiflow Randomizer (Audiobus) free?
Midiflow Randomizer (Audiobus) costs $1.99, with no in-app purchases.
Is Stellr free?
Stellr costs $4.99, with no in-app purchases.
Which has better reviews, Midiflow Randomizer (Audiobus) or Stellr?
Stellr is rated higher. Midiflow Randomizer (Audiobus) averages 3.0 out of 5 from 4 ratings, while Stellr averages 3.4 from 9 ratings.
Do Midiflow Randomizer (Audiobus) or Stellr have ads?
Neither Midiflow Randomizer (Audiobus) nor Stellr shows ads.
Which is updated more often, Midiflow Randomizer (Audiobus) or Stellr?
Midiflow Randomizer (Audiobus) ships an update every 11 months, and Stellr every 40 months. Most recently, Midiflow Randomizer (Audiobus) was updated on October 24, 2026 and Stellr on October 19, 2026.

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