MIDIRack

MIDIRack

the ultimate MIDI toolkit

8 ratings
6 reviews
$14.99
In-App Purchases

Details

  • Released
  • Updated
  • August 20, 2026
  • September 3, 2026

Features

MIDIRack video #1 for iPhone
MIDIRack screenshot #2 for iPhone
MIDIRack screenshot #3 for iPhone
MIDIRack screenshot #4 for iPhone
MIDIRack screenshot #5 for iPhone
MIDIRack screenshot #6 for iPhone
MIDIRack screenshot #7 for iPhone
MIDIRack screenshot #8 for iPhone
MIDIRack screenshot #9 for iPhone
MIDIRack screenshot #10 for iPhone
iphone
ipad
🖼️Get Icon
Icons↘︎

About

Design custom MIDI control surfaces with a variety of instruments and sequencers. Unlock advanced features like a visual MIDI processing graph for complex routing and generative music creation. Use it standalone, as an AUv3 plugin, or to control desktop DAWs.

✓Customizable touch surface design
✓KB-1 keyboard suite with MPE support
✓Advanced step and matrix sequencers
✓Visual MIDI processing graph
✓Built-in instruments and samplers
✓Connects to desktop DAWs via USB or Bluetooth
Show original description

What's New in MIDIRack

1.1

September 3, 2026

Now on iPhone. The app and the AUv3 plug-in run on iPhone in landscape, with a folding menubar, a full-screen lane editor, and a surface thats optimized for the small screen. New - Presets sync with iCloud and appear in Files as named .midirackpatch files. Organise them in folders, import and export them. - Multi-page control surfaces with named pages and page-select buttons. - Strings grid in any key: pick a root and scale, and glide stays pitch-true. - Custom drum pad layouts: set every pad's note and label, or learn from your kit. - Bluetooth MIDI pairing in MIDI Ports. - Dockable inspector you can float or hide. Inspectors and the surface scroll by scrollbar so sliders never pan the view (switch back in Settings). - Play from your computer keyboard: QWERTY piano, Z/X octave, C/V velocity, 1–8 and Q–I for drum pads. - XY mode on the Seaboard and Strings surfaces: left-right sends pressure, up-down sends slide, independently. - Apple Pencil expression: force plays the keys and pads, and drives pressure separately from slide on the MPE surfaces. Custom response curves per keyboard, with a live preview pad. - CC pickers list standard controller names. Fixed - AUv3 failing to load in some hosts on iOS 18. - AUv3 fits small host windows: compact chrome, a minimum size, and a scrolling surface. - Keyboards and sequencer UI at one row high. - Release bounce when dragging surface controls, and keys triggering through sheets.

More
1

Subscriptions & In-App Purchases

$7.99

Graph Editor Unlock

Unlock the graph editor (one time purchase)

User reviews

Great concept... when it works.

List of weird/broken things after 10h of making patches:

(1) Can't rename modules in the Graph Editor when my iPad is in landscape. Landscape only. However, when modules are renamed, they do not always show up as their new name in the Surface Builder. Pretty rough, because Graphs get complicated quickly, and it's hard to tell what things are from their default name.

(2) Snap module does not work, as far as I can tell. You cannot quantize notes timing-wise to your rhythm. Sucks if you're doing generative MIDI, which is the main reason to buy this app over KB-1 IMO.

(3) CC Math > Invert does not work. Sidechaining MIDI (eg muting a hi-hat when a kick hits) must be done some other way that I haven't figured out or is impossible.

(4) None of the "-scope" views display Node Parameter values, despite having controls to be bound to those values. Obviously I want to see how a value is changing over time if I'm modulating it -- but I can't.

(5) The Bounce Generator does not have physics between the balls or even different starting points when you add more balls. Sounds silly, but it means that a 4-ball generator just plays the same rhythm, transposed slightly differently. This seems incorrect (see any other physics-based MIDI tool), bordering on false advertising.

I have a dozen other friction points -- try setting a specific Note output with the default Slider or Knob, good luck! -- but most of them boil down to differing UI sensibility.

I sent a support email to the address on their website ("we read every message!") but have not received a response after three days. You might be on your own if you buy this one.

Given that $15 + $15 is Premium-Tier in the iOS music scene, I'd hold off on this one. Drambo, Imaginando LK, and Prism Sequencer are much more mature and will do this kinda thing without the admittedly-awesome Graph Editor + Surface Builder workflow. Still, I'd love to see MidiRack live up to its concept.

It's just not there, not yet.
Show more

I really enjoy this app but…

I really need dotted and triplet notes for all note divisions. It’s something I request for all apps but midi including dotted and triplet notes is perhaps more important to me. Looking forward to see what happens with this app going forward. It reminds me a little bit like working in the note grid for bitwig.
Show more

Great creative and deep tool.

I bought it soon after it was released and loved the deep modular routing possibilities with an intuitive interface. I was concerned when the touch response on the sequencer lanes wasn’t always working . Kai responded instantly to my questions and fixed it days later (works perfect now!) Also, I asked about file management and preset folders and he added that stuff now with the latest update. What more could you ask for from a developer.
Show more

If you make music with an iPad you need this

Thank you Kai for putting together such a great piece of work. Everything works flawlessly so far.

S U P E R B

hot out of the fryer, and this meal was ready to serve. ambitious for any music dev—but he nailed it. I definitely recommend the node editor IAP to reap the maximum benefits of the app; moreover, the upgrade sits humbly out of your way, never pressuring a purchase.

for the record, a very thoughtfully executed 'cheatsheet' seamlessly loads within the app when needed for nodular reference, leaving your creativity uninterrupted. incredibly lightweight on DSP, too. thus far weighs in on my mind as one of the important iOS releases this year.

I had been wondering what would follow Mr. LoFi... but was in no way anticipating an entire workflow reconfiguration. you've outdone yourself, Kai! thank you for this incredible release!
Show more

Developer apps

FAQ

What is MIDIRack?

MIDIRack is a comprehensive MIDI toolkit for iPad that allows you to design custom control surfaces, build complex sequencers, and create generative music. It can be used standalone, as an AUv3 plugin, or to control desktop DAWs.

How much does MIDIRack cost?

The base MIDIRack app is free to download. An in-app purchase unlocks the full MIDI graph functionality, which costs $7.99.

Does MIDIRack have ads?

No, MIDIRack does not contain advertisements. The app is free to download and offers optional in-app purchases for advanced features.

What devices does MIDIRack support?

MIDIRack is available for both iPhone and iPad, supporting iOS devices.

How often is MIDIRack updated?

MIDIRack was last updated on September 3, 2026, with version 1.1. This indicates active development and regular improvements.

Can MIDIRack be used with desktop DAWs?

Yes, MIDIRack can connect to desktop DAWs like Logic, Live, and Bitwig via a single USB cable using IDAM or wirelessly over Bluetooth MIDI. No additional drivers or helper apps are required.

What are the key features of the MIDIRack MIDI graph?

The MIDI graph, unlocked via in-app purchase, offers over 60 node types for processing MIDI, including arpeggiators, sequencers, and generative pattern creators. It also includes built-in instruments like a Synth, Sampler, and Loop Slicer.

What is the user sentiment for MIDIRack?

MIDIRack has received overwhelmingly positive feedback, with an average rating of 5.0 stars from 5 ratings. This suggests users are highly satisfied with its functionality and performance.