Key Lens
Create, play and learn chords.
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Free
In-App Purchases
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About
Start with a scale.
Every chord, note, and progression in the app stays locked to the key you pick.
Explore common chord progressions or build your own!
Extensive options for voicings, inversions, extensions, borrowed chords, alternate bass notes, and more.
Learn to play your chord progression on piano!
Easy to read, color coded piano diagrams make playing your chords on a real piano easy.
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What's New in Key Lens
1.4
September 22, 2026
New and improved UI. Decoupled features for a better user experience. Added bass section to remote page with chord follow features.
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Subscriptions & In-App Purchases
$9.99
Midi Output
Send MIDI to your DAW, synths, and grooveboxes
