Comparison

miRack vs Audulus 4

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

miRack

This app offers a comprehensive Eurorack-style modular synthesizer environment for creating custom synths, audio/MIDI effects, and controlling other applications. It features a vast library of modules and integrates with hardware and software for flexible music production and live performance.

Highlights
  • Polyphonic Eurorack-style modular environment
  • Over 800 third-party modules
  • AUv3 plugin hosting
  • Multi-channel audio input/output
  • MIDI input/output with clock sync
  • Ableton Link support
  • iCloud patch syncing
Features
Read full description

miRack is a polyphonic Eurorack-style modular environment. It aims to provide user experience and audio quality close to those of the real Eurorack hardware. miRack can be used to build custom synthesizers, audio and MIDI effects, control other apps and equipment, as a playground to explore and learn modular synths, and for live performances. miRack is also available on macOS, including Audio Unit and VST plugins. * Comes with more than 800 modules created by third-party developers and adapted for mobile devices by miRack team. New modules are added regularly. * Includes AUv3 plugin. Can work as an instrument, audio effect or MIDI processor. Supports parameter automation to record and automate changes of almost any virtual module control. * AUv3 hosting capabilities (in-app purchase). Incorporate any AUv3 instrument, effect or MIDI effect plugins into your patches. * Controller module (in-app purchase) allows to design AUv3 user interface for your patch. * Multi-channel audio input and output (in both standalone and AUv3 modes), with full support for Expert Sleepers audio interface modules to integrate with hardware Eurorack equipment. * MIDI input and output, including MIDI clock sync, and MIDI learn function. Automate and control your patch, or control other software and hardware instruments with powerful sequencer modules. * Ableton Link support to synchronise with other music software on the same device or over network. * iCloud support to sync patches between iOS and macOS app versions. * Visit patchstorage.com/platform/mirack for inspiration and to share your patches.

About

Audulus 4

Create and shape sounds with a professional-grade modular synthesizer environment. Explore a vast library of modules for synthesis and sound design, with the option to expand your toolkit with premium instruments and effects. Available across Apple devices for seamless workflow.

Highlights
  • Modular synthesizer environment
  • Sound design tools
  • Real-time audio shaping
  • Extensive module library
  • Premium Pro Modules (in-app purchases)
  • Cross-device iCloud sync
  • AUv3 plugin support
Features
Read full description

Build synthesizers. Design sounds. Shape audio in real time. All with professional-grade, low-latency performance ready for live use — and it’s free. Audulus gives you a complete modular environment at no cost. Its clean, fluid interface stays out of the way so you can focus on what matters: exploring sound. A modular playground with room to grow — from first experiments to advanced designs. Looking for more? Discover the Pro Module series: premium instruments and effects that show what’s possible when world-class sound design meets true modular freedom. Each Pro Module is crafted specifically for Audulus, giving you new ways to expand your sonic toolkit. Available on iPhone, iPad, and Mac — your modular system travels with you. ▶ What People Are Saying: "gem for Apple platforms – gorgeous, fluid" — Peter Kirn, createdigitalmusic.com "stunning!" — Richard Devine, devinesound.net "Remarkable gesture control" — sequencer.de ▶ Join our forum and Discord community! ▶ What You Get: • Complete modular environment — free to download and explore • Pro Module series — premium modules available as in-app purchases • Available on iPhone, iPad, and Mac with iCloud sync • Standalone app or AUv3 plugin • Deep node library for building from scratch • Extensive module library for synthesis and sound design • Multi-channel signal flow for polyphony and complex routing • Next-gen multi-core audio processing • Smooth, high-performance graphics even with massive patches • MIDI I/O with MIDI learn • GLSL shader node for creating advanced visuals • Lua scripting for custom DSP and vector graphics Terms of Use: https://audulus.com/terms.html

Screenshots

miRack4 screens
Audulus 44 screens

Verdict

The call

The clearest difference is price: Audulus 4 at Free against miRack's $14.99. miRack's advantage is rating (4.8 vs 4.3) and update cadence (weekly vs monthly). 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

Audulus 4 is free to download; miRack costs $14.99 up front. miRack sells 5 one-off in-app purchases and Audulus 4 sells 27 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

miRack holds the better App Store score, 4.8 against 4.3. That said, the two scores are not equally well evidenced: miRack has 674 ratings behind it against 74, so its average is the more settled of the two. Written reviews point the same way: 86% of miRack's written reviews are positive against 69% of Audulus 4's.

UpkeepUpdate frequency

miRack ships an update weekly, Audulus 4 monthly. The most recent releases landed on September 25, 2026 and September 12, 2026 respectively.

Scorecard6 real differences · 4 level
miRack versus Audulus 4: the parameters behind the verdict, then further details
ParametermiRackAudulus 4
Price$14.99Free — better
Rating4.8 (674 ratings) — better4.3 (74 ratings)
Positive reviews85.9% of reviews — better69.2% of reviews
Number of ratings674 — better74
Update frequencyWeekly — betterMonthly
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad, Mac
Requires iOS14.0 — better18.0
Further details — not scored
Size359 MB103 MB
Age rating4+4+
DeveloperMIFKI PTY LTDAudulus LLC

Customer experience

miRack

All ratings674 ratings
Positive96.4%
Neutral1.8%
Negative1.8%
Written reviews227 reviews
Positive85.9%
Neutral6.2%
Negative7.9%

Audulus 4

All ratings74 ratings
Positive82.4%
Neutral4.1%
Negative13.5%
Written reviews78 reviews
Positive69.2%
Neutral10.3%
Negative20.5%

User reviews

miRack

From 674 App Store ratings

What we love

  • 🚀 Powerful modular synth capabilities
  • 👍 Intuitive touch-based interface
  • 🎨 Vast selection of modules
  • 💰 Great value for the price
  • 🔌 Seamless integration with external controllers

Room to improve

  • 🐛 Occasional crashes and stability issues
  • 📚 Lack of built-in documentation and tutorials
  • 🔀 Difficulty navigating and managing patches
  • 🔇 Missing audio recording and export features

Audulus 4

From 74 App Store ratings

What we love

  • ✨ Powerful modular environment
  • 💡 Deep DSP programming capabilities
  • 🎨 Intuitive and beautiful UI
  • 🚀 Seamless workflow across devices
  • 📚 Great for learning synthesis

Room to improve

  • 💸 Expensive in-app purchases/subscriptions
  • ⚠️ Steep learning curve for beginners
  • 📱 UI issues on mobile (scrolling, view obstruction)
  • 📉 High CPU usage
  • ❓ Lack of comprehensive documentation

Bugs and requests

miRack

Reported bugs

3 issues
  • Knob controls sometimes become unresponsive
  • Saving and loading patches can be unreliable
  • Compatibility issues with older iPad models

Requested features

5 requests
  • Add polyphonic support
  • Implement undo/redo functionality
  • Integrate with popular DAWs and audio apps
  • Provide more comprehensive module library
  • Add preset management and sharing options

Audulus 4

Reported bugs

13 issues
  • iOS 18 compatibility issues (app not working)
  • Save presets but no 'Load' button
  • Undo command issues with DAWs
  • CMD+Z causing data loss
  • Opt+drag not duplicating modules
Show 8 more
  • Plugin window not resizable
  • Menu filtering not functioning properly on iPhone
  • Select and Import buttons not working
  • Blank screen on open
  • App freezes on iPad Pro
  • Black screen on launch after update
  • No modules appearing after iOS 18 update
  • Patches not appearing after iOS 18 update

Requested features

7 requests
  • Add 'Load' button for presets
  • Improve DAW integration (Undo, duplicate)
  • Resizable plugin window
  • More modules (FFT/IFFT, granular buffering)
  • Add CC in module
Show 2 more
  • Sync to host as AUv3
  • Make upgrade path clearer from Audulus 3

In-app purchases

5 purchases

miRack

One-time5
  • Small Tip$0.99
  • Medium Tip$2.99
  • Large Tip$4.99
Show 2 more
  • AUv3 Hosting Modules$4.99
  • Controller Module$4.99
27 purchases

Audulus 4

Subscriptions2
  • Audulus Pro (1 Month)7 Days trial$4.991 Month
  • Audulus Pro (1 Year)7 Days trial$29.991 Year
One-time25
  • 1-shot Sample$1.99
  • P-Train$2.99
  • CLK RS-1$3.99
Show 22 more
  • CG-1 Chord Generator$3.99
  • CLK Clock Generator$4.99
  • MetaEnvelope$4.99
  • Modal Percussion$4.99
  • CLK: TimeWarp$4.99
  • CPR-1$4.99
  • LMT-1$4.99
  • MS-FUNC$5.99
  • CLK SS-516$7.99
  • J-23 Reverb$7.99
  • J-23 Effects$7.99
  • CLK GS-1$7.99
  • Chaos LFO Bundle$7.99
  • ARP-1$7.99
  • CPR-3$7.99
  • SynD-K1$7.99
  • TRIKOR VCO$9.99
  • CLK Tools Bundle$9.99
  • Essential Synth Bundle$9.99
  • VCF Bundle 1$9.99
  • J-23 Space Console$14.99
  • Patch Editing$29.99

Questions

Is miRack free?
miRack costs $14.99, and also offers in-app purchases.
Is Audulus 4 free?
Audulus 4 is free to download, with in-app purchases available.
Which has better reviews, miRack or Audulus 4?
miRack is rated higher. miRack averages 4.8 out of 5 from 674 ratings, while Audulus 4 averages 4.3 from 74 ratings.
Do miRack or Audulus 4 have ads?
Neither miRack nor Audulus 4 shows ads.
Which is updated more often, miRack or Audulus 4?
miRack ships an update weekly, and Audulus 4 monthly. Most recently, miRack was updated on September 25, 2026 and Audulus 4 on September 12, 2026.

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