About Chordal
This single-function app uses the microphone to listen to sounds and show their overall frequency content. It is intended as a musical tool for visualisation of pitches, harmonics and harmony. Technically, this is a...
This single-function app uses the microphone to listen to sounds and show their overall frequency content. It is intended as a musical tool for visualisation of pitches, harmonics and harmony.
Technically, this is a conventional FFT (Fast Fourier Transform) shown as colours. These are presented over the black and white keys of a keyboard tuned at 440Hz. It covers notes (or harmonics) from C2 (65Hz) to B7 (3951Hz) using octave bands.
Or, putting this another way, the keyboard lights up where there's pitch. Watch your sopranos spread the note and flatten. Works with a wide range of instruments.
Inspired by a conversation with Chuck Knowledge.
Dec 8, 2021
Version 1.2.2
Stop application from going into "idle" mode when screen not touched.
Previous Versions
Here you can find the changelog of Chordal since it was posted on our website on 2016-10-19 05:17:17.
The latest version is 1.2.2 and it was updated on 2026-06-11 04:59:27. See below the changes in each version.
Chordal version 1.2.2
Updated At: 2021-12-08
Changes: Dec 8, 2021 Version 1.2.2
Stop application from going into "idle" mode when screen not touched.
Chordal version 1.2.1
Updated At: 2021-11-06
Changes: Nov 6, 2021 Version 1.2.1
Updated to reflect changes in iOS since last release.
Chordal version 1.2.0
Updated At: 2018-08-21
Changes: Aug 21, 2018 Version 1.2.0
This version addresses iOS changes since the last release.
Chordal version 1.1.2
Updated At: 2015-05-10
Disclaimer
Official App Store Link
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