Auto Chord is a "chord follower" that automatically generates chord accompaniment from live music. Unlike apps that require the user to manually program a sequence of chords, Auto Chord automatically detects chord notes and uses the information to control a pad synth, which is included in the app.

The chord detector uses a model based approach to pick the best chord based on harmonic similarity and complexity. User controls include trigger level set sliders (note on/off levels), and a list of the types of chord to use (e.g., major, minor, 7th, diminished, etc.).

The internal pad synth is based on our xMod FM synthesis technology. A touch sensitive sound space controls timbre of the instrument. Other controls change register, decay, and portamento.

MIDI is sent on channel 1.

N.B. Although the app works with most music, it is essential the music be "in tune" (A4 = 440 Hz). It is also best to minimize percussion and ambient noise.

What’s New

Version 2.5

Audiobus 3 compatible. Now sends MIDI data!

Ratings and Reviews


Works as advertised

One of the best audio midi controllers works better than midi guitar 2, works exceptionally well ignore the negative reviews this is a must have app

Oceans in space ,

Need to know your rig

So this is actually pretty cool for live midi pads behind stringed instruments. Once i had played with the settings and got a good input level it worked well. Now its not like other guitar single note midi guitar, but it played cool ambient synth and displayed interesting chords. I think there is value more in a way if you just think of the app as unique and it does in fact work!


Mark Carlotto
5.3 MB
Requires iOS 11.1 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2013 Intelligent Gadgets


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    With Family Sharing set up, up to six family members can use this app.

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