C
E
G
C
F
A
B
D
G
A
C
F
D
G
B
E
G
C
F
A
C
G
B
D
G
C
E
A
C♯
E
D
F♯
A
E
G♯
B
Bâ™­
D
F
Eâ™­
G
Bâ™­
0 / 0
♪
0 / 0

This is an implementation of Eguchi's Chord Identification method (paper access can be found via Sci-Hub). See also Ichionkai Music School. The code is open source and developed on GitHub. Attribution and licensing information for the included audio, software, fonts, and icons is available in the third-party notices.

Here is a short video explaining how we use it.

This is a method for teaching absolute pitch to children aged 2-6. Children should practice ~5x per day for 2-3 minutes (about 20-25 identifications). Chords are always identified with colors, and progress in the sequence red (CEG), yellow (CFA), blue (HDG), black (ACF), green (DGH), orange (EGC), purple (FAC), pink (GHD), brown (GCE).

Introduce the chords to the children one at a time, spacing out new chord introductions by at least 2 weeks each time. Do not introduce a new chord until the child can identify all presented chords with 100% accuracy.

What's New

Web-only Preview

2026-08-05

  • On Android, the app now hides the status bar while keeping three-button navigation controls visible.

Android Version v2026.08.1

2026-08-02

  • Made the statistics history popup taller so more sessions are visible at once.

Android Version v2026.08.0

2026-06-06

  • Fixed the stats history popup, which was too wide and required horizontal scrolling.
  • Single note stats now appear in the stats history popup when single note mode is active.

2025-07-05

  • Added option to persist the cat reaction face between sessions.

2025-06-18

  • Fixed incorrect display of Bb and Eb note shapes.

2024-12-01

  • Added single note trainer: after identifying a chord, you can now practice identifying the individual notes.
  • Added per-session single note statistics.
  • Added settings to control when the single note trainer appears (always, never, black chord levels only, or only after correct/incorrect answers).

2024-11-23

  • Added user profiles so multiple children can track progress separately.
  • Guest users can now change settings without creating a profile.
Music Trainer: Play the chords manually
A
B
Bâ™­
C♯
C
D
E
Eâ™­
F♯
F
G♯
G
A
B
Bâ™­
C
D
E
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