Comparison

KORG Module Pro vs AUM

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

Head to head
About

KORG Module Pro

This app provides a high-quality mobile sound module for iOS devices, offering professional piano and keyboard sounds. It's ideal for live performance and music production, allowing users to create studio-quality music anywhere with just an iOS device and a MIDI keyboard. Expandable sound libraries and integration with other music apps enhance its capabilities.

Highlights
  • High-quality piano and keyboard sound engines
  • Six dedicated sound engines
  • Ultra-low latency
  • AUv3 support
  • Set list function with score viewer
  • Expansion sound libraries
  • Performance recording and sharing
Features
Currently charting
Read full description

The best sounds, available to everyone. Announcing a new high-quality mobile sound module app for iOS! • Achieved the #1 position*on the App Store* in the Top Paid Music App category *USA, UK, Japan, Germany, France, Italy, Canada and much more! Ideal for performance and music production, KORG Module is a high-quality sound module app for iOS that contains a professional sound library. With just your iPad/iPhone and a MIDI keyboard such as the new microKEY, you can play studio-quality keyboard and grand piano sounds anywhere. You can also use the sounds of KORG Module for the KORG Gadget music production app. Maintaining its position at the forefront of mobile music apps, KORG now offers you a new style of performance and production with KORG Module for iOS. FEATURE HIGHLIGHTS ● Stunningly high-quality piano and a full range of keyboard sound engines ● Six dedicated sound engines : Acoustic Piano/Electric Piano/Clav/Organ/Multi/Hybrid ● Ultra-low latency sound engine ● AUv3 support ● With just an iPad/iPhone and the new microKEY, you can enjoy great sound anywhere ● Mobile music production in tandem with KORG Gadget ● Convenient set list function with a PDF/image score viewer and music player ● Power-up even more with expansion sound libraries: TRITON Best Selection / Ivory Mobile Grand and more! ● Easily record your performances, and share song sketches on SoundCloud ● Integrating iOS technology that's indispensable for the mobile environment *** Stunningly high-quality piano and a full range of keyboard sound engines *** KORG Module has five dedicated sound engines, providing a number of high-quality sounds that can be played back on your iOS using the "NATIVE ENGINE”. These engines feature technology that was developed for KORG's historic line of workstations and synthesizers including: Acoustic Piano, Electric Piano, Clav, Organ, Multi, and Hybrid. Each display has carefully selected parameters, making it convenient and easy to adjust the sounds. We’ve also carefully ensured ideal playability and designed the system for ultra-low latency. Once you experience the quality of the sounds being produced from the slim body of your iPad, you'll agree that Module is radically different than anything else currently on the market. *** With just an iPad/iPhone and the new microKEY, you can enjoy great sound anywhere *** KORG Module and the microKEY are the best possible combination for a mobile performance environment. With the new microKEY which supports a damper, or the microKEY Air which provides a wireless connection via Bluetooth MIDI, your iPad can transform into a high-quality sound module. In your room, in a practice studio, or performing on stage,, it's easy to set up and immerse yourself in a superb playing experience wherever you are. Of course you can also use any MIDI keyboard that can connect to your iPad via Apple Lightning - USB camera adapter. The velocity curve function conforms the sound to your playing dynamics, so you'll be able to perform comfortably using any MIDI keyboard. Even if you don't have a MIDI keyboard, you can use the apps on-screen keyboard, phrase function, or MIDI player to play the sounds. The MIDI player can load and play standard MIDI files for your listening enjoyment. *** Mobile music production in tandem with KORG Gadget *** You can also use the high-quality KORG Module sounds inside KORG Gadget, the mobile music production app. If you have Module and Gadget, the five tools Salzburg, Montreal, Alexandria, Firenze, and Glasgow are added inside, allowing access the same way as Gadget. These five powerful gadgets will add even more variety to your music productions, raising your music to the next level. Whether for performance or for production, both of these apps deliver ultimate sound. More info at korg.com

About

AUM

This app is a versatile audio mixer, recorder, and connection hub for mobile devices. It allows users to connect various audio sources, route signals, apply effects, and record mixes with high fidelity. It supports advanced features like MIDI control, synchronization, and integration with other audio apps and hardware.

Highlights
  • Connect hardware inputs/outputs
  • Route audio and MIDI
  • Host Audio Unit extensions
  • Record mixes and individual tracks
  • Synchronize with Ableton Link
  • Built-in processing nodes
  • MIDI control and routing
Features
Read full description

AUM is the flexible audio mixer, recorder, and connection hub for your iPad, iPhone and iPod touch. Connect hardware inputs and outputs, Audio Unit extensions, Inter-App Audio apps, Audiobus, soundfile players, built-in signal processing and filters, in any configuration you want. Route anything to anywhere with mix-busses, effect sends, audiobus ports, and external multi-channel audio interfaces. Play hosted synths and instruments using the built-in keyboard or external MIDI controllers, or sequence them with AU MIDI plugins or from other apps using Virtual MIDI. Record mixes, individual tracks, or both, straight into the storage space of AudioShare (no copying of files needed), with synchronized start and end for perfect loops. Play back recordings, soundfiles and loops as channel sources in the mixer for backing tracks, further processing or mixing. Soundfiles can be opened from anywhere, including USB drives on iOS 13 and later. Route and filter MIDI in any way you like using the MIDI matrix. Combine and filter MIDI endpoints using MIDI buses. Synchronize everything with the transport clock and play in time with other apps or devices using Ableton Link. Connect external music machines and synchronize them with MIDI Clock. Includes built-in processing nodes for various stereo processing, Mid/Side balance and conversion, EQs and filters, limiting, clipping and saturation. Or use any 3rd party Audio Unit extension or Inter-App Audio effect. All controls in the mixer can be controlled via MIDI, including parameters of hosted and built-in plugins. "A brilliant idea that has been brilliantly executed. Top-notch technical stuff and highly recommended" - MusicAppBlog "Feature rich, powerful, intuitive, and simple to use" - DubSpot "Executes live mixing with surprising ease, with a load of extensive features under the hood, quick snappy response on the screen and audio" - AudioNewsRoom FEATURES • High quality audio up to 32-bit 192kHz • Clean and intuitive user interface with crisp vector graphics • Unlimited number of channels • Unlimited number of effect slots • Inserts and sends are configurable pre/post-fader • Internal busses for mixing, effect sends, signal splitting • Supports multi-channel audio interfaces for both inputs and outputs • Supports built-in speaker and mic, including stereo mic on devices that has it. • Supports Audio Unit extensions, Inter-App Audio and Audiobus • Route MIDI output from Audio Unit extensions • Supports Audio Unit multiple output and input busses (for side-chaining etc) • Highly accurate transport clock • Metronome with selectable output and optional pre-roll • Sends host sync to Audio Unit plugins and IAA apps • Play in time with Ableton Link, with Start/Stop support • Slave external hardware via MIDI Clock • FilePlayer with sync and looping with access to all your soundfiles • Records straight into AudioShare storage space • Record synchronized beat-perfect loops • Built-in nodes for stereo processing, filtering and dynamics • Latency compensation makes everything align at the outputs • Optional manual compensation using TimeOffset • Multiple Inter-App Audio / Audiobus output ports • Audiobus state saving • Built-in MIDI keyboard • Fully MIDI controllable • MIDI Matrix for routing MIDI anywhere • MIDI filtering for any MIDI destination • Combine MIDI sources or destinations using MIDI buses BUILT-IN SIGNAL PROCESSING • Stereo balance • Stereo to mono • Stereo panning • Mid/Side balance • Mid/Side - Stereo convert • Invert Phase • Parametric EQ • Low-shelf filter • High-shelf filter • Low-pass resonant filter • High-pass resonant filter • LP/HP combo filter • First order All-pass filter • Second order All-pass filter • Gain • Hard clip • Saturation • Lookahead peak limiter • System-provided Apple Audio Units

Screenshots

KORG Module Pro4 screens
AUM4 screens

Verdict

The call

The clearest difference is price: AUM at $24.99 against KORG Module Pro's $39.99. AUM also leads on review sentiment (82% vs 64%) and iOS requirement (12.0 vs 15.6). KORG Module Pro's advantage is update cadence (monthly vs every 3 months) and chart position (#142 vs unranked). On rating, ratings volume, ads and in-app purchases 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

KORG Module Pro costs $39.99 and AUM $24.99 up front. KORG Module Pro sells 20 one-off in-app purchases and AUM sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.6 for KORG Module Pro against 4.7 for AUM. Both are backed by a comparable volume of ratings — 1.2K and 534 respectively. Written reviews are what separate them: 64% of KORG Module Pro's written reviews are positive against 82% of AUM's.

UpkeepUpdate frequency

KORG Module Pro ships an update monthly, AUM every 3 months. Both last shipped on October 24, 2026.

Scorecard5 real differences · 6 level
KORG Module Pro versus AUM: the parameters behind the verdict, then further details
ParameterKORG Module ProAUM
Price$39.99$24.99 — better
Rating4.6 (1.2K ratings)4.7 (534 ratings) — better
Positive reviews63.8% of reviews81.9% of reviews — better
Number of ratings1.2K — better534
Update frequencyMonthly — betterEvery 3 months
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
Best chart rank#142 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.612.0 — better
Further details — not scored
Size1.7 GB13 MB
Age rating4+4+
DeveloperKORG INC.Kymatica AB

Customer experience

KORG Module Pro

All ratings1,228 ratings
Positive91.5%
Neutral3.3%
Negative5.2%
Written reviews354 reviews
Positive63.8%
Neutral13.8%
Negative22.3%

AUM

All ratings524 ratings
Positive93.3%
Neutral1.5%
Negative5.2%
Written reviews315 reviews
Positive81.9%
Neutral5.7%
Negative12.4%

User reviews

KORG Module Pro

From 1.2K App Store ratings

What we love

  • 🎹 Excellent sound quality
  • 🎨 Versatile sound library
  • 📋 Useful set list functionality
  • 🔌 Good MIDI integration
  • 💻 Seamless integration with Korg Gadget

Room to improve

  • 🔇 Low volume/output issues
  • 🐛 Crashes and stability problems
  • 🔀 Inconsistent behavior when switching patches
  • 🔒 Difficulty restoring purchased content
  • 🔍 Limited sound customization options

AUM

From 534 App Store ratings

What we love

  • 👍 Excellent audio routing and mixing capabilities
  • 🚀 Powerful and flexible workflow
  • 💡 Seamless integration with AUv3 and IAA apps
  • 👍 Intuitive and clean user interface
  • 👍 Reliable and stable performance

Room to improve

  • 🐛 Occasional crashes or stability issues
  • 💡 Lack of MIDI clock sync receive functionality
  • 💡 Limited visual customization options (e.g. channel sizes)
  • 🐛 Compatibility issues with some hardware interfaces

Bugs and requests

KORG Module Pro

Reported bugs

4 issues
  • Purchased content not appearing or disappearing
  • Sustain pedal not functioning properly
  • Polyphony issues causing notes to drop out
  • Compatibility problems with newer iOS versions

Requested features

5 requests
  • Add split and layer functionality
  • Implement MIDI learn capabilities
  • Improve set list management with reordering and copying
  • Add support for background audio and AUv3
  • Provide better integration with other Korg apps

AUM

Reported bugs

3 issues
  • Crashes or freezes when using certain plugin combinations
  • Compatibility issues with iOS 15 and newer
  • Inconsistent MIDI transport controls

Requested features

4 requests
  • Add MIDI clock sync receive capability
  • Implement a timeline/sequencer view
  • Provide more visual customization options
  • Improve support for external hardware integration

In-app purchases

20 purchases

KORG Module Pro

One-time20
  • Hybrid Synth Essential 2$3.99
  • Future Synths$4.99
  • London Symphonic Orchestra$6.99
Show 17 more
  • Dream Pop$6.99
  • Petrichor$6.99
  • Shoulder Pads$6.99
  • Space Western$6.99
  • Wurley Electric Piano$9.99
  • Mellow Tape Keyboard$9.99
  • Soundiron Voice of Rapture Soprano$9.99
  • Wild Kits$9.99
  • Dreamy Synths$9.99
  • Organ & Clav Collection$19.99
  • TRITON Best Selection$19.99
  • 80's Electric Piano$19.99
  • Orchestral Dreams$19.99
  • Classic EP-88M$19.99
  • Ivory Mobile Grand$29.99
  • Module Performance Expansion$29.99
  • Ivory Mobile American D$29.99
4 purchases

AUM

One-time4
  • Small Tip$0.99
  • Medium Tip$1.99
  • Large Tip$4.99
Show 1 more
  • Huge Tip$9.99

Questions

Is KORG Module Pro free?
KORG Module Pro costs $39.99, and also offers in-app purchases.
Is AUM free?
AUM costs $24.99, and also offers in-app purchases.
Which has better reviews, KORG Module Pro or AUM?
AUM is rated higher. KORG Module Pro averages 4.6 out of 5 from 1.2K ratings, while AUM averages 4.7 from 534 ratings.
Do KORG Module Pro or AUM have ads?
Neither KORG Module Pro nor AUM shows ads.
Which is updated more often, KORG Module Pro or AUM?
KORG Module Pro ships an update monthly, and AUM every 3 months. Most recently, KORG Module Pro was updated on October 24, 2026 and AUM on October 24, 2026.

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