# QuantiChord — MIDI Chord Quantizer

> MIDI effect that generates and quantizes chords from incoming notes. (iPhone/iPad app by Laurent Colson.)

- Source: https://appshunter.io/ios/app/quantichord/id1439713799 (this page in markdown: same URL + `.md`)
- Developer: [Laurent Colson](https://appshunter.io/developer/381525765)
- Category: Music
- Price: $12.99
- Rating: 4.00/5 from 11 App Store ratings · 5 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 34 MB
- Languages: American English
- Released: 2018-11-16
- Data updated: 2026-08-27
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/quantichord/id1439713799/reviews.md

## What is QuantiChord?

"QuantiChord" is a MIDI effect that generates chords from incoming notes and quantizes the results to a pre-defined scale. It can be used as a standalone application or as an AUv3 MIDI effect plug-in.

The chord is generated by adding up to 8 transposed notes to the original note played. Once the chord is generated, it is quantized to limit it to the selected output scale.

The application supports full internal and external MIDI connections for input and output. An internal sound bank is included.

The AUv3 MIDI effect plug-in supports multiple instances. A compatible host is required to run the plug-in. The host must support the Audio Unit v3 (AUv3) MIDI effect format.

Hosts supporting AUv3 MIDI effect on iOS: 
Logic Pro, Cubasis, Beatmaker, AUM, Audiobus, NanoStudio, Auria Pro, apeMatrix.

Hosts supporting AUv3 MIDI effect on macOS: 
Logic Pro 10.7 or later.

Features:

• Standalone application and AUv3 MIDI effect plug-in
• 8 transposing sliders from -24 to +24 semi-tones (+/- 2 octaves) 
• 1 global transposer slider
• Scale quantizer
• Lockable parameter protection when switching presets
• Resizable keyboard
• Multitasking support
• Stop "Audio Background" automatically after inactivity (15 min, 30 min, 1 h, 2 h, or never)
• Sample-accurate timing
• Internal sound bank
• Receiving MIDI from external MIDI sources
• Internal routing of inputs, outputs
• Send MIDI to a virtual port usable as MIDI input by other "Core MIDI" compatible apps
• Random creation of presets
• Presets browser
• "Program Change" support
• Preset sharing support by "AirDrop", "Mail", "Messages", and other supported services
• Native iCloud support
• "iCloud Drive" support in the "Files" app on iOS and "Finder" on macOS
• Full support of "Windowed Apps" mode on iPad
• Undo/Redo

Supported MIDI connections:

• Virtual "Core MIDI" connections between applications
• Any compatible MIDI interface
• MIDI over Wi-Fi
• MIDI over Bluetooth

## Key features

- Standalone app and AUv3 MIDI effect plugin
- Chord generation with transposing notes
- Scale quantization
- Full internal and external MIDI support
- Internal sound bank
- Preset management and sharing

## Recent user reviews (5 of 5)

All indexed reviews: https://appshunter.io/ios/app/quantichord/id1439713799/reviews.md

### 5/5 — Quite reliable, perfect tool.

*2023-03-05*

This is kind of a perfect tool for at least two occasions. Best of all, I don’t recall ever having any hanging notes while using this. Which can’t always be said for others. 

The two functions I use this most for are:
1. Forcing a scale. You can deselect notes you don’t want to play. As a bonus, this feature is ‘after’ the interval choice option. So your chords stay in key. 
2. Intervals from a single key press. It’s not something I need on every channel. But when I need this function (which is periodic occasions), this is my absolute go to. Sometimes it’s just octave stacking. Other times it’s 7th chords. Etc. this just does the job. 

I have not made much use of some of the additional preset recall features or locking feature. I really should.

### 4/5 — Adds a “chord memory” mode to any AUv3 instrument!

*2022-12-13*

Some synths have had a “chord memory” mode where you can program in a chord. Then when you play a single key, it plays that chord transposed to that note. By using AUM to route MIDI through this app, you can effectively add such a mode to any AUv3 instrument! It also lets you limit what notes it will generate so that—unlike most “chord memory” features—you can restrict the chords generated to a particular scale This—for me—makes it quite a bit more useful.

I think it could be improved by adding a display of what notes it is actually generating so that you could understand exactly what the quantization is generating.

### 5/5 — works perfect

*2020-09-30*

no wrong promises, no bugs

### 1/5 — Good tool, could need an update IMHO

*2020-05-29*

1) It would be great if we could get the params for the channels (why not???)

A master control to switch channels would be good.

2) Randomize for the channels and tune too?

3) Transpose 8 never gets randomized?

4) Please refine the randomizer, it spits out way more high tones than low ones (randomize>reverse order?)

5) Please, and this one is really important:

Give us for all sakes a swipe option for the transpose levels.

5 Stars if the next update covers the above.

Really good app, but needs an update, IMHO.

### 1/5 — Downloaded, tried, then deleted.

*2018-12-24*

I can’t think of a single application this could be used for. Quite useless. 
Doesn’t even tell you the chord makeup..
Can’t organize chord progressions. 
What did I pay $7 for?  
Nothing... unfortunate that I cannot get my money back. 
App downloaded, and deleted.

## Frequently asked questions about QuantiChord

### What is QuantiChord?

QuantiChord is a MIDI effect that creates chords from incoming notes and quantizes them to a chosen scale. It can be used as a standalone app or an AUv3 MIDI effect plugin.

### How does QuantiChord generate chords?

It adds up to 8 transposed notes to the original note played. The resulting chord is then quantized to fit a pre-defined output scale.

### What MIDI connections does QuantiChord support?

QuantiChord supports full internal and external MIDI connections, including virtual Core MIDI, compatible MIDI interfaces, MIDI over Wi-Fi, and MIDI over Bluetooth.

### Can QuantiChord be used as a plugin?

Yes, QuantiChord functions as an AUv3 MIDI effect plugin. It requires a compatible host application that supports the AUv3 MIDI effect format.

### What hosts support QuantiChord's AUv3 plugin?

On iOS, hosts like Logic Pro, Cubasis, Beatmaker, AUM, and Audiobus support it. On macOS, Logic Pro 10.7 or later is compatible.

### Does QuantiChord have ads?

No, QuantiChord does not contain advertisements. It is a paid application.

### What is the price of QuantiChord?

QuantiChord is available for a one-time purchase of $12.99.

### How often is QuantiChord updated?

The latest version is 2.3, released on January 29, 2026. Updates typically occur to improve features and compatibility.

## Version history (last 5 releases)

### 2.3 — 2026-01-29

• New option to automatically stop Audio Background when the app is inactive (15 min, 30 min, 1 h, 2 h, or never)
• Minor bugs fixed

### 2.2.1 — 2025-11-11

• Minor bugs fixed

### 2.2 — 2025-09-24

• Full compatibility with iOS / iPadOS 26
• Support for Windowed Apps mode on iPad
• Integration of the new menu bar in iPadOS 26
• Stability and performance improvements

### 2.1.1 — 2024-11-13

• Minor bugs fixed

### 2.1 — 2023-05-30

• Compatibility with Logic for iPad
• Minor bugs fixed

## Apps similar to QuantiChord

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Chord ai - Play any song!](https://appshunter.io/ios/app/chord-ai-play-any-song/id1446177109) | 4.6 (5,900) | Free | Music |
| [SongSheet Pro: Setlist helper](https://appshunter.io/ios/app/songsheet-pro-setlist-helper/id581094194) | 4.7 (2,679) | Free | Music |
| [Chordify: Songs, Chords, Tuner](https://appshunter.io/ios/app/chordify-songs-chords-tuner/id1073624757) | 4.7 (33,443) | Free | Music |
| [Ultimate Guitar: Chords & Tabs](https://appshunter.io/ios/app/ultimate-guitar-chords-and-tabs/id357828853) | 4.7 (473,250) | Free | Music |
| [Guitar Scales & Chords Power](https://appshunter.io/ios/app/guitar-scales-and-chords-power/id647000751) | 4.8 (92) | $5.99 | Music |
| [Navichord • chord sequencer](https://appshunter.io/ios/app/navichord-chord-sequencer/id916452748) | 4.7 (586) | $7.99 | Music |

## More apps by Laurent Colson

- [MusicMath](https://appshunter.io/ios/app/musicmath/id381525762)
- [ChordPolyPad](https://appshunter.io/ios/app/chordpolypad/id694599930)
- [StepPolyArp](https://appshunter.io/ios/app/steppolyarp/id1361313588)

All apps by Laurent Colson: https://appshunter.io/developer/381525765

## Related topics

[laurent colson](https://appshunter.io/ios/topics/laurent-colson)

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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 2026-08-27.*