Chord Keys is a free piano practice app. It identifies the chords you play, suggests new ones to explore, and lets you hear them instantly, directly in your browser.
Use a MIDI keyboard, your computer keyboard, or the on-screen piano. No account or installation required.
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Reading a chord diagram and finding the notes on a keyboard are two separate steps. Chord Keys connects them: the reference explains the chord, and the same page lets you play it.
We designed the experience to be accessible without registration, with chord recognition and audio handled locally in the browser.
Project details
The learning library brings explanations and interactive keyboards together, so visitors can read about a chord and play it on the same page.
Reference pages are generated as HTML, with interactive features for playing the examples. Chord recognition and sound generation run in the browser.
