MIDIRack vs chorDLE
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MIDIRack
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
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MIDIRack is a MIDI toolkit for iPad. Build a custom touch surface from the KB-1 keyboard suite, an all-new sequencer suite, knobs, faders, buttons and more — then unlock a visual MIDI processing graph (one time in-app purchase) and wire it into anything, from a simple custom controller to a full-on groovebox or a self-playing generative composer. Play it on its own and send MIDI anywhere, as an AUv3 plugin in your favourite host or a standalone instrument. THE BASE APP — PERFORMANCE SURFACE Design a custom control surface on a snapping grid: • The KB-1 keyboard suite — piano, diatonic chord pads, scale-locked keyboard, MPE Seaboard ribbon, MPE Strings grid (4ths), and a 4×4 GM drum-pad grid. Each is its own routable node with latch and octave shift. Successor to the KB-1 Expressive Keyboard Suite. • A suite of sequencers — drum, melody, chord, analog and CC step grids and a Matrix note grid, with a moving playhead, swing and microtiming. Per-step velocity, probability, tie and trigger conditions; pattern chaining and 4-pad scene switching for full arrangements; a knob-per-step analog machine that re-roots live as you play. • Knobs, faders, XY pads, buttons and live visualizers — bind to raw MIDI CC or graph parameters. On its own: a rich custom control surface builder — send MIDI and CC to any synth, app or hardware, no graph required. WITH YOUR DESKTOP DAW Expressive MPE hardware costs hundreds. MIDIRack turns the iPad you already own into a controller for Logic, Live, Bitwig, Cubase or any desktop DAW: • Two MPE surfaces — the Seaboard ribbon and the Strings grid send per-note pitch bend, slide and pressure to any MPE-capable instrument on your desk. • A controller that changes per track — MPE ribbon for the lead, drum pads for the beat, chord pads for the progression, faders mapped to CC for a mix move. Rearrange in seconds; save a surface per project. • Sequence it too — clock the step lanes to your DAW and drive its tracks. • Easy to connect — one USB cable to a Mac via IDAM (Inter-Device Audio and MIDI), or wirelessly over Bluetooth MIDI. No driver, no helper app. UNLOCK — MIDI GRAPH (in-app purchase) Wire MIDI In → processors → MIDI Out on a visual canvas: • 60+ node kinds — arpeggiators, scale/key quantizers, transposers, chords, echoes, swing, humanize, euclidean rhythms, random/generative melodies, LFOs, CC tools, an analog knob-per-step sequencer, a Matrix sequencer and a Counter. • Built-in instruments — Synth, Drums, a Sampler and a loop Slicer make sound right in the graph; no external synth required. • Emergence generators — Conway's Game of Life, Turing machine, Wolfram rules, Markov, bouncing balls, Lorenz attractor — for evolving, living patterns. • Presets — factory patches grouped by category (control surfaces, generators, keyboards, utilities): Amen Engine, Starfield, Conway Choir, Turing Bass, Cellular Drums… Save your own. ROUTING & MPE • MIDI Out exposes all 16 channels plus an MPE connector — multitimbral, multi-instrument setups. The built-in synth responds to MPE. • Every keyboard is its own node — process and route each one independently. PLAYS OUT OF THE BOX • Built-in polyphonic synth, drum kit, sampler & slicer or send MIDI to your gear via CoreMIDI and an always-on virtual port.
chorDLE
This app helps you develop your ear for music by training you to recognize chords and intervals from real songs. It offers various interactive modes, including hands-free options and multiplayer challenges, to improve your musical understanding and playing ability.
- Chord progression training from real songs
- Harmony Wheel visualization
- Hands-free playing modes (Blindfold Test, Sing It Back)
- Multiplayer room hosting and joining
- VoiceOver support
- 14 levels of interval and chord recognition
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If you can hear chords, you can sit down and play with other people without having to guess what they are playing. chorDLE trains that with chord progressions taken from real songs. The songbook holds 17,023 songs, and every progression shows you the songs that use it. I–V7–vi–IV alone appears in 199, including Goodbye Yellow Brick Road, Little Red Corvette and With Or Without You. Learn to hear the patterns and start sitting down with music and musicians and playing along. Start with one question: major or minor. No theory needed. Tap a chord to hear it, then answer. After each hand, the chords light up on the Harmony Wheel by the job they do in the key: tonic, predominant or dominant. The Colors level adds sevenths, suspended, augmented and diminished chords, voiced the way the songs play them. Three ways to play hands-free: - Blindfold Test: hear an interval, say its name. - Sing It Back: hear it, then sing it. - Chord Trainer by voice: say "play", then call out the chords. Or play the original chorDLE: a chord plays, you pick out the intervals inside it, and you fill a line on your card. Fourteen levels take you from two-note intervals to full seventh chords. Host a room and play the chords while everyone guesses, or join with a six-character code. VoiceOver works across the Chord Trainer. Free to start, with no sign-up needed to play. Sign in with Discord or Apple to sync across devices and join the leaderboard. Made by the producers and musicians at Beat Kitchen, a real community with weekly gyms, office hours and feedback sessions. Your ears are better than you think.
Screenshots
Verdict
The clearest difference is price: chorDLE at Free against MIDIRack's $7.99. chorDLE also leads on in-app purchases (none vs 1) and review sentiment (100% vs 67%). MIDIRack's advantage is ratings volume (9 vs 3). On update cadence, ads, device support and iOS requirement 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
chorDLE is free to download; MIDIRack costs $7.99 up front. MIDIRack sells 1 one-off in-app purchase. chorDLE asks for nothing beyond the download.
chorDLE holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 9 and 3 respectively. Written reviews point the same way: 67% of MIDIRack's written reviews are positive against 100% of chorDLE's.
MIDIRack ships an update every 4 days, chorDLE every 3 days. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.
| Parameter | MIDIRack | chorDLE |
|---|---|---|
| Price | $7.99 | Free — better |
| Rating | 4.8 (9 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 66.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 9 — better | 3 |
| Update frequency | Every 4 days | Every 3 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 | 16.0 — better |
| Further details — not scored | ||
| Size | 28 MB | 26 MB |
| Age rating | 4+ | 4+ |
| Developer | Kai Aras | Beat Kitchen LLC |
Customer experience
MIDIRack
chorDLE
In-app purchases
MIDIRack
- Graph Editor Unlock$7.99
chorDLE
No in-app purchases









