Comparison

KORG Module Pro vs Retro MIDI Player Mobile

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
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

Retro MIDI Player Mobile

Features
Read full description

レコンポーザ形式(RCP / R36 / G36)が鳴る、iPhone/iPad/iPhone Duo用のMIDIプレイヤーです。 1990年前後、PC-98シリーズのレコンポーザで作られた曲を、当時のファイルのままiPhone/iPad/iPhone Duoで開いて再生できます。 オレンジ色の液晶を思わせる高密度な画面に、Port A/Bの全32パートを一覧表示。各パートの音色名やレベル、演奏の動きを見ながら、あの頃のデータをもう一度楽しめます。iPhoneとiPadはどちらも縦画面と横画面で使え、iPhoneの横画面ではオレンジの液晶表示も楽しめます。iPhone Duoでは、開いても、半開きでも、閉じても、それぞれの姿勢に合わせた配置で使えます。 Piano Roll画面では、32パートの音符が上から鍵盤へ落ち、発音の流れを演奏と同期して見渡せます。 Piano Roll画面からは、楽譜とリズムの表示にも切り替えられます。楽譜では、レコンポーザのトラック画面のようなイベント一覧と2小節ずつの譜面に、ピッチベンドやエクスプレッションの変化を重ねたグラフを並べて表示。リズムでは、ドラムのパートをリズム名とドットの格子でまとめて表示します。 画面をロックしても再生は続き、ロック画面から曲送りや一時停止を操作できます。CarPlayでは車の画面から曲リストを開いて曲を選べ、ホーム画面やロック画面、CarPlayのダッシュボードにはウィジェットも置けます。 外部音源は、Core MIDI対応のMIDIインターフェースから出力できます。16パートまでなら1系統、Port A/Bの32パートを実機で鳴らす場合は、独立した2つのMIDI出力を使用します。SC-88VLやMU2000などの実機にも対応しています。 外部音源をお持ちでない場合も、内蔵音源だけでPort A/B全32パートを同時に再生できます。GS互換のサウンドに加え、SF2形式のサウンドフォントをご自身で指定すれば、XG音源や昔のパソコンやゲーム音源に似せるなど、お好みの音色に差し替えることも可能です。内蔵音源はApple M1以降を搭載するiPad、iPhoneではA19 ProプロセッサのiPhone 17 Pro以上での動作を推奨・確認済みです。それ以前の世代でも、詳細設定(iPadはHelp画面、iPhoneは設定画面)で最大同時発音数やUI描画FPSを下げることで、内蔵シンセサイザーに必要な演算性能不足からくる音切れを抑えられます。 主な機能 ・レコンポーザ形式(.rcp / .r36 / .g36)の再生 ・標準MIDIファイル(.mid / .midi)の再生 ・内蔵音源による単体再生(GM/GS準拠、Port A/B全32パート) ・SF2形式のユーザー定義音源への対応 ・Port A/B、全32パートの液晶風モニター ・鍵盤へ向かって上から下へ流れるPiano Roll ・楽譜(トラック譜面)とリズムパターンの表示 ・外部MIDI音源へのCore MIDI出力 ・画面ロック中の再生と、ロック画面からの操作 ・CarPlayとウィジェットへの対応 ・プレイリストの保存と、次回起動時の復元 ・曲を開くボタンからのファイル選択(iPadはOpen MIDI) ・iPhone/iPadの縦画面・横画面とiPhone Duoに対応 ・曲データからGS音源の特定音色マップやXG音源向けかを判定し、接続した複数の音源の中から最適な音源を選択して再生(曲ごとにポート設定変更が不要) レコンポーザ時代の曲と、実機の表示を眺めながら聴いた時間を、iPhone/iPad/iPhone Duoでもう一度。

Screenshots

KORG Module Pro4 screens
Retro MIDI Player Mobile4 screens

Verdict

The call

The clearest difference is price: Retro MIDI Player Mobile at $2.99 against KORG Module Pro's $39.99. Retro MIDI Player Mobile also leads on in-app purchases (none vs 10) and update cadence (every 4 days vs monthly). KORG Module Pro's advantage is iOS requirement (15.6 vs 17.0). 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

CostPrice · In-app purchases · Ads · Monetization

KORG Module Pro costs $39.99 and Retro MIDI Player Mobile $2.99 up front. KORG Module Pro sells 10 one-off in-app purchases. Retro MIDI Player Mobile asks for nothing beyond the download.

UpkeepUpdate frequency

KORG Module Pro ships an update monthly, Retro MIDI Player Mobile every 4 days. The most recent releases landed on November 8, 2026 and November 10, 2026 respectively.

Scorecard4 real differences · 6 level
KORG Module Pro versus Retro MIDI Player Mobile: the parameters behind the verdict, then further details
ParameterKORG Module ProRetro MIDI Player Mobile
Price$39.99$2.99 — better
Rating4.6 (1.2K ratings) — better—
Positive reviews63.8% of reviews—
Number of ratings1.2K — better—
Update frequencyMonthlyEvery 4 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.6 — better17.0
Further details — not scored
Size1.7 GB40 MB
Age rating4+4+
DeveloperKORG INC.Hideo Suzuki

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

Retro MIDI Player Mobile

Not enough reviews yet to summarise bugs or requests.

In-app purchases

10 purchases

KORG Module Pro

One-time10
  • Hybrid Synth Essential 2$4.99
  • Wurley Electric Piano$9.99
  • Mellow Tape Keyboard$9.99
Show 7 more
  • 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
None

Retro MIDI Player Mobile

No in-app purchases

Questions

Is KORG Module Pro free?
KORG Module Pro costs $39.99, and also offers in-app purchases.
Is Retro MIDI Player Mobile free?
Retro MIDI Player Mobile costs $2.99, with no in-app purchases.
Do KORG Module Pro or Retro MIDI Player Mobile have ads?
Neither KORG Module Pro nor Retro MIDI Player Mobile shows ads.
Which is updated more often, KORG Module Pro or Retro MIDI Player Mobile?
KORG Module Pro ships an update monthly, and Retro MIDI Player Mobile every 4 days. Most recently, KORG Module Pro was updated on November 8, 2026 and Retro MIDI Player Mobile on November 10, 2026.

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