# Konstrukt — Audio/MIDI plugin builder

> iPad MIDI toolkit for building custom controllers, sequencers, and generative music. (iPhone/iPad app by Kai Aras.)

- Source: https://appshunter.io/ios/app/konstrukt/id6779712751 (this page in markdown: same URL + `.md`)
- Developer: [Kai Aras](https://appshunter.io/developer/370820899)
- Category: Music, Utilities
- Price: $7.99 with in-app purchases (on sale, was $14.99)
- Rating: 4.80/5 from 10 App Store ratings · 6 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.0 · 65 MB
- Languages: American English
- Released: 2026-08-20
- Data updated: 2026-11-10
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/konstrukt/id6779712751/reviews.md

## What is Konstrukt?

Konstrukt is a patchable instrument for iPad and iPhone. Design the surface you play, sequence it, give it sound with built-in instruments and your own AUv3 plug-ins, mix and record it — and when you want to go deeper, unlock the visual graph underneath and rewire all of it. Standalone, and as an AUv3 in your host.

SURFACES YOU DESIGN

• The KB-1 keyboard suite — piano, diatonic chord pads, scale-locked keyboard, MPE Seaboard ribbon, MPE Strings grid (4ths) and a 4×4 drum-pad grid, each with an arpeggiator. Successor to the KB-1 Expressive Keyboard Suite.

• Knobs, faders, XY pads, buttons, live visualizers and channel strips on a snapping grid, in pages like hardware banks. Bind any control to MIDI CC — or, with the unlock, to any parameter in the patch.

A SUITE OF SEQUENCERS

• Drum, melody, chord, analog and CC lanes, the Drum Grid, a Metropolis-style Stage Seq and a Matrix note grid — tap to edit, with per-step velocity, probability, trigger conditions, ratchets and microtiming.

• Patterns up to four bars, eight banks per lane. Record into patterns step by step or live, then fix it in the grid. A Looper with quantize, undo and expression capture.

• Players: one tap on a lane writes a pattern from a style and a Complexity slider — drums with fills, a bass under your chords, chord stabs and pushes.

• One patch key and scale every lane can follow, custom scales, and chord lanes with their own rhythm layer.

INSTRUMENTS AND YOUR PLUG-INS

• Built in: a two-oscillator Synth, a Wavetable synth, Drums, MegaSaw, a Sampler and a loop Slicer, plus Drive, Filter, Delay, Reverb, Compressor, EQ, Chorus and Phaser — each with its own panel.

• Host your AUv3 instruments, effects and MIDI effects inside the patch (standalone app), with floating plug-in windows, presets and bindable parameters.

THE RACK

• A strip per instrument: fader, pan, mute and solo, inserts, pre- or post-fader sends to bus strips, sidechain, MIDI Learn, master inserts, and scenes recalled with a fade. Hardware synths join as External Instruments.

• Bring a mic or guitar in on its own channel. Record the master and stems to 24-bit WAV. Tap tempo, metronome with count-in, Ableton Link, MIDI clock in and out. Multi-output routing on a multi-channel interface.

UNLOCK — THE GRAPH EDITOR (in-app purchase)

Everything above runs on one visual graph that carries MIDI and audio. Unlock the editor to rewire it:

• 80+ node kinds — arps, scale quantizers, chords, echoes, swing, euclidean rhythms, LFOs and CC tools, wired MIDI In → processors → instruments or MIDI Out.

• Components — save a cluster of nodes as one card with real ports, its surface cards included; drop saved components into any patch and edit them inside.

• Audio on the same canvas — cable instruments through effect chains and hosted effects, split sends to buses, key a sidechain. The Rack is this graph seen as strips.

• Emergence generators — Game of Life, Turing machine, Wolfram rules, Markov chains, bouncing balls, a Lorenz attractor — patterns that evolve instead of loop. Every keyboard is a routable node, every knob can drive any parameter.

Factory graph patches open and play without the unlock. The unlock is the editor and nothing else.

WITH HARDWARE, OTHER APPS OR A DESKTOP DAW

• MIDI out over CoreMIDI, extra output ports and an always-on virtual port: 16 channels plus MPE.

• One USB cable to a Mac, or Bluetooth MIDI — two MPE surfaces and a controller that reshapes per track, no driver needed.

• As an AUv3, load Konstrukt as a MIDI processor or as an instrument in hosts such as AUM, Logic Pro, GarageBand, Cubasis, Drambo and Loopy Pro.

PRICING

One-time purchases, no subscription. The app is the whole instrument; the graph editor is a single optional unlock. One purchase covers iPad and iPhone.

Requires iOS 17 or iPadOS 17 or later; on iPhone the app runs in landscape. Plug-in hosting, audio input and recording are part of the standalone app. No user data is collected.

## Key features

- 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

## Pricing and in-app purchases

Base price: $7.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Graph Editor Unlock | $7.99 | one-time |


## Is Konstrukt safe?

Not enough ratings yet to assess Konstrukt.

## Is Konstrukt legit?

Konstrukt appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Konstrukt is 75 out of 100 points across 7 verification signals from App Store and developer data.

## Recent user reviews (6 of 6)

All indexed reviews: https://appshunter.io/ios/app/konstrukt/id6779712751/reviews.md

### 3/5 — Great concept... when it works.

*2026-09-16*

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.

### 5/5 — I really enjoy this app but…

*2026-09-01*

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.

### 5/5 — Great creative and deep tool.

*2026-08-29*

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.

### 5/5 — If you make music with an iPad you need this

*2026-08-22*

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

### 5/5 — S U P E R B

*2026-08-22*

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!

### 3/5 — Offer should read base app 7.99 plus graph editor another 7.99 🙄

*2026-08-21*

Is this an error or unclear pricing?

## Frequently asked questions about Konstrukt

### 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.

## Version history (last 5 releases)

### 1.2 — 2026-11-09

Konstrukt 1.2 — the biggest update yet.

• Host AUv3 instruments, effects and MIDI effects inside the patch — and make sound without one: Synth, Wavetable, Drums, MegaSaw, Sampler and Slicer, with Drive, Filter, Delay, Reverb, Compressor, EQ, Chorus and Phaser, each with its own panel
• The Rack page — the audio side on one page: a strip per instrument with inserts, sends, sidechain, MIDI Learn, master inserts and scenes with fades; External Instrument channels for hardware
• Audio in, master and stem recording, Ableton Link, MIDI clock in and out, tap tempo, count-in, multi-output routing
• New sequencers — the Drum Grid (a whole kit in one lane), the Beat Map (an X/Y pad that blends drum patterns), the Metropolis-style Stage Seq, and a Chord Seq with rhythm, strum and voicing layers; patterns up to four bars, eight banks per lane, record into patterns, ratchets, custom scales, a patch key every lane follows
• Components — fold a cluster of nodes and its surface cards into one card with real ports; save it, drop it into any patch, edit it inside (graph editor)
• Players — tap the star on a lane and it writes a Drum, Drum Grid, Step, Analog or Chord Seq pattern from a style and a Complexity slider
• An arp on every keyboard, a MIDI FX slot on every track, New Patch templates and many more improvements across the board

### 1.1 — 2026-09-03

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.

### 1.0.2 — 2026-08-27

MIDIRack now runs on iPadOS 17.

Apple Pencil
• Pencil force plays the keyboards and pads
• On the expressive surfaces, force drives per-note pressure independently
  of slide — two separate expression axes

Presets
• Organize saved patches into folders
• Share patches as files — export, AirDrop, and import

Drum pads
• Give any pad its own note and label, or learn a note from your kit
• Step sequencer note picker is now a named dropdown

Quality of life improvements 
• The inspector is a dockable panel you can float or hide, with sliders
  that no longer fight with scrolling
• In small AUv3 host windows, the chrome, preset browser, and lanes
  fit themselves to the space
• New app settings for launch behavior, session restore, and haptics

Fixes
• Keyboards no longer go silent or trigger the wrong key after a resize
• Keys no longer play through open sheets and panels
• Two touches on one key now sound as two independent voices
• Step lane value drags stay pinned to the step you started on
• Fixed a bounce when releasing a dragged control
• The graph editor keeps its viewport and ignores stray taps while pinching

### 1.0.1 — 2026-08-24

• Fix sequencer lane switch buttons not responding to touches
• Standalone: autosave the working patch and restore it on launch
• Add a MIDI panic button (all notes off, transport untouched)
• Node reference in the inspector; 
• Add per-device MIDI input nodes (standalone): route streams by origin
• Add a CC Filter node: pass or block selected CC numbers
• Add MIDI Learn: drive surface controls from external hardware
• LFO/Clock Free mode runs at a true Hz rate, not a tempo-scaled division

### 1.0 — 2026-08-20

No release notes.

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## More apps by Kai Aras

- [MIDIBrute](https://appshunter.io/ios/app/midibrute/id1010753735)
- [RP-1 Delay](https://appshunter.io/ios/app/rp-1-delay/id1079530569)
- [RF-1 Reverb](https://appshunter.io/ios/app/rf-1-reverb/id1097763239)
- [VC-1 Chorus](https://appshunter.io/ios/app/vc-1-chorus/id1130683829)
- [Italizer](https://appshunter.io/ios/app/italizer/id1133091743)
- [VOLT Synth](https://appshunter.io/ios/app/volt-synth/id1185984394)

All apps by Kai Aras: https://appshunter.io/developer/370820899

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-11-10.*