Key Lens
Create, play and learn chords.
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Free
In-App Purchases
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About
Compose your next song!
Sequence chords, melody and bass MIDI tracks.
Connects to the rest of your setup.
Play hardware synths or instruments in your DAW. Use Key Lens as a MIDI controller over USB or Bluetooth.
Build better chord progressions.
Find your starting point with common chord progressions from multiple genres.
Give your chords movement.
Use arpeggios and strum to shape how your chords play.
Learn to play your chords on piano.
Follow along on piano with easy-to-read charts.
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What's New in Key Lens
1.5
November 4, 2026
A C++ engine for audio and midi scheduling greatly improves performance. New user interface! Sequencing features, work standalone and sync connected devices with MIDI clock 7 day free trial on MIDI In-App purchase
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Subscriptions & In-App Purchases
$9.99
Midi Output
Send MIDI to your DAW, synths, and grooveboxes
