KB-1 Keyboard Suite 4+

Expressive MIDI Controllers

Kai Aras

    • 4.8 • 238 Ratings
    • $12.99



KB-1 MIDI Keyboard

KB-1 is a suite of expressive virtual keyboards and controllers designed for a multitude of scenarios.

Play multiple instruments simultaneously, complete with MIDI Polyphonic Expression, scales, chords, strumming and more.

- 8 distinct Keyboard Layouts
- Multiple Rows per Keyboard
- Multiple Octaves per Keyboard Row
- 15+ Scales (for layouts that support scales)
- MIDI Polyphonic Expression (MPE)
- Powerful Arpeggiator
- Standalone operation with multiple Keyboards and dedicated MIDI outputs per Keyboard
- AUv3 MIDI Plugin

- Classic (Piano Keys + Wheels)
- Uniform (Seboard-style Keys and Layout)
- String (String-style Keys)
- Scale (Uniform layout with scale support)
- Chord (One key per chord for all scale degrees)
- Drum (up to 16 user mappable drum pads)
- XY (up to 2 configurable XY-Pads)
- CC (up to 16 user mappable knobs for CC control)

- Glide (horizontal)
- Slide (vertical)
- Velocity (mapped to y-axis)
- Pressure (iPhone only)

App Connectivity:
- Standalone
- AUv3 MIDI Instrument

MIDI Connectivity:
- Inter-App MIDI
- Network MIDI

What’s New

Version 1.3.4

- Added support for pressure to iPad version via Apple Pencil
- Added an option to play KB-1 from a physical computer keyboard (think Ableton Live)
- Fixed an issue where MPE keyboards would occasionally send erroneous MIDI messages
- Fixed Ableton Link
- Various minor bug fixes

Ratings and Reviews

4.8 out of 5
238 Ratings

238 Ratings


Correcting earlier 1-star review

I left a 1-star review on Feb 21 that I need to update/correct to a 5-star. In that review I said I couldn’t get KB-1 to connect to any instrument, but that I thought the app had a lot of potential. I emailed the developer at the same time, and he responded very quickly and pointed me to the solution. I didn’t check it out until now, and it did solve the problem. The app now works perfectly and it is as awesome as I expected it to be! The fix is that the destination app needs to have background audio (or the setting to allow the app to run in the background) must be set to be on. I admit that’s a no-brained that I should have looked for, but I assumed that would be the default operation for those apps. Apparently it’s not. Changing that setting was all that was needed. Now KB-1 works great and I am completely satisfied.

ezFish ,

Lovely tool that offers a lot

This type of tool should’ve been standard for all music applications that come out today on iOS. Especially the DAWs. This app is very well implemented as a standalone and Auv3. The settings page for Auv3 could use an improvement to show more info on-screen.

Someone left a recent review that stating this tool didn’t work in Cubasis. Maybe it didn’t once but, it works well now! Now if Cubasis would give me the option to make KB1 the default keyboard, things would be golden!

Reward yourself with the future touch keyboards for iOS.

Bradium ,

Ableton should be sponsoring this app

It took me a little bit to get it figured out how to get MPE midi data out of my iPad and into Ableton’s instruments, but once I did it worked awesome. Ableton supports MPE as of version 11 in a few of their most popular instruments including Wavetable, Simpler and Sampler. Once you get midi in from KB-1, you can map the notes, and x/y touch positions of slide and glide to any parameter you want in the Ableton instruments. The app is very well designed, I just wish there was some documentation somewhere.

App Privacy

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

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

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

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