KORG Module Pro vs Midiflow Keyboard (Audiobus)
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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
Midiflow Keyboard (Audiobus)
This music app provides a versatile keyboard interface for controlling multiple synth applications simultaneously. It offers various layouts, including piano, scales, and chords, with customizable controls for pitch, modulation, and note velocity. Designed to integrate seamlessly with Audiobus 3, it enhances mobile music production.
- Piano, scale, and chord layouts
- Multiple independent keyboard strips
- Adjustable key range and octaves
- Pitch-bend and modulation wheels
- Hold mode with unisono option
- Velocity control via touch or accelerometer
- Split View/Slide Over support
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This keyboard for Audiobus 3 allows you to perform music with multiple synth apps at the same time. Use the piano or scale layout to play single notes, and select the chord keyboard for accompaniments. With Audiobus 3, it's super simple to connect the keyboard to your synth apps. + Piano layout + Scale layouts (Min/Maj Blue, Ionian, Dorian, ...) + Chord layout + 2 independent keyboard strips on the iPad, 3 on the iPad Pro + Quickly switch sounds + Adjust visible key range and + Jump to other octaves using up/down buttons + Transpose output in half-tone steps + Modulation wheel + Pitch-Bend wheel + "Hold" mode with unisono option + Note velocity can be controlled via position or acceleration of the touch, or set to a fixed value + Use Split View/Slide Over to display the keyboard next to other apps NOTE: This app requires Audiobus 3. Insert it into one or more MIDI sender ports to control the synth apps in the MIDI output ports of the respective pipelines. DETAILS Midiflow Keyboard is probably the most essential MIDI companion app for Audiobus. It allows you to trigger your synth apps with sophisticated layouts for single notes or chords. With its two keyboards, you can even perform with multiple sounds simultaneously. HANDY CONTROLS The streamlined user interface shows the most important controls on the main screen. Quickly change the visible key range in octave steps – you can even keep holding down keys while doing so. Switch on "hold" and keys will stay pressed until you hit them again. Or activate "unisono" and only one note will sound. And, of course, there are pitch-bend and modulation wheels for effects. PLAY WITH SENSITIVITY It's not only about which notes you play, but how you play them. By default, you play louder notes by hitting them further down the length of the key. You can also make the app interpret the actual velocity of your taps by using the accelerometer. However, if all you want is a fixed velocity on each tap, that is possible, too. OPTIMIZE YOUR LAYOUT Choose from a list of different keyboard styles that match your playing style best. The regular piano layout is just the beginning. You can select from a list of scale layouts to explore their different sounds and play solos without ever hitting a wrong note. Screen space is valuable – hide the pitch-bend and/or modulation wheel if you don't need them, making more space for keys. PLAY CHORDS LIKE A PIANIST Since it can be quite tricky to play chords on a touch screen, this app comes with a unique chord keyboard. The lower row triggers root notes, while the upper rows trigger chords. This layout makes it very easy to play chord accompaniments with index and middle finger that would require two full hands on a real piano. SWITCH SOUNDS QUICKLY The port selector in the upper right corner allows you to specify, for each keyboard, which sound to trigger. You can even select multiple destinations to layer the sounds. In order to reflect the active sound, the color scheme of the keyboard will adjust to match the app's icon. SPLIT VIEW AND SLIDE OVER Midiflow Keyboard works great in Split View and Slide Over, the two multitasking modes in iOS. Just swipe from the right screen side and launch the keyboard. That way, you can trigger nodes while making adjustments in an effect app or Audiobus itself. In order to take full advantage of the screen space, the keyboard is rotated 90 degrees. You can either use the right hand to play it while using the left hand in the main app, or simply rotate the device to use both hands for the keys.
Screenshots
Verdict
The clearest difference is price: Midiflow Keyboard (Audiobus) at $2.99 against KORG Module Pro's $39.99. Midiflow Keyboard (Audiobus) also leads on in-app purchases (none vs 20) and rating (5.0 vs 4.6). KORG Module Pro's advantage is update cadence (monthly vs every 9 months) and ratings volume (1.2K vs 6). On ads 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
KORG Module Pro costs $39.99 and Midiflow Keyboard (Audiobus) $2.99 up front. KORG Module Pro sells 20 one-off in-app purchases. Midiflow Keyboard (Audiobus) asks for nothing beyond the download.
Midiflow Keyboard (Audiobus) holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: KORG Module Pro has 1.2K ratings behind it against 6, so its average is the more settled of the two. Written reviews complicate that: 64% of KORG Module Pro's written reviews are positive against 50% of Midiflow Keyboard (Audiobus)'s, so the app with the better star average is not the one people write more warmly about.
KORG Module Pro ships an update monthly, Midiflow Keyboard (Audiobus) every 9 months. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.
| Parameter | KORG Module Pro | Midiflow Keyboard (Audiobus) |
|---|---|---|
| Price | $39.99 | $2.99 — better |
| Rating | 4.6 (1.2K ratings) | 5.0 (6 ratings) — better |
| Positive reviews | 63.8% of reviews — better | 50.0% of reviews |
| Number of ratings | 1.2K — better | 6 |
| Update frequency | Monthly — better | Every 9 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 10.2 — better |
| Further details — not scored | ||
| Size | 1.7 GB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | KORG INC. | Johannes Doerr |
Customer experience
KORG Module Pro
Midiflow Keyboard (Audiobus)
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
Midiflow Keyboard (Audiobus)
Not enough reviews yet to summarise bugs or requests.
In-app purchases
KORG Module Pro
- Hybrid Synth Essential 2$3.99
- Future Synths$4.99
- London Symphonic Orchestra$6.99
Show 17 moreShow fewer
- 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
Midiflow Keyboard (Audiobus)
No in-app purchases
Questions
Is KORG Module Pro free?
Is Midiflow Keyboard (Audiobus) free?
Which has better reviews, KORG Module Pro or Midiflow Keyboard (Audiobus)?
Do KORG Module Pro or Midiflow Keyboard (Audiobus) have ads?
Which is updated more often, KORG Module Pro or Midiflow Keyboard (Audiobus)?
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