KeyFlow: MIDI Scale Filter

Scale filtering for MIDI keys

$8.99

Shape your MIDI playing with scale filtering, Auto Detect and Chord Aware controls. Includes an AUv3 MIDI effect and a standalone router for iPhone and iPad. KeyFlow filters MIDI notes before they reach your instrument on iPhone and iPad. Choose a root and scale, set Strictness, and play in key. KeyFlow processes MIDI locally; your instrument or music app produces the sound. FEATURES - Manual scales, modes and pentatonic scales - Adjustable Strictness and Allow All Notes - Auto Detect Scale with a confidence setting - Adaptive Harmony and Chord Aware filtering - Test Notes, note counters and All Notes Off - AUv3 MIDI effect for compatible hosts BLUETOOTH MIDI Connect a Bluetooth MIDI keyboard privately inside KeyFlow. The controller's original MIDI input stays inside KeyFlow while the filtered KeyFlow Out is available to other apps. On iPad, this lets you play an instrument in GarageBand while KeyFlow continues routing in the background. A Bluetooth MIDI controller and a compatible receiving instrument app are required for this workflow. OTHER MIDI INPUTS KeyFlow can route MIDI from system inputs such as USB keyboards. Choose the input and output in the standalone app. Configure the receiving app to use the filtered KeyFlow Out and avoid routing the original keyboard directly to the instrument. You can also load the AUv3 MIDI effect before an instrument in a compatible host. Automatic scale and chord estimates depend on the notes you play. Chord Aware adds a configurable 0–50 ms grouping delay. MIDI 2.0 / UMP support is not claimed. No account, ads or analytics. Available with the same universal purchase as KeyFlow for Mac once both platforms are approved.

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The developer, Alexandros Dervos, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

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    Information

    Seller
    Alexandros Dervos
    Size
    1 MB
    Category
    Music
    Compatibility
    Requires iOS 16.0 or later.
    • iPhone
      Requires iOS 16.0 or later.
    • iPad
      Requires iPadOS 16.0 or later.
    • Mac
      Requires macOS 13.0 or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English
    Age Rating
    4+
    Copyright
    © 2026 DERVOS ALEXANDROS
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.

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