KeyLens
Scales, Chords & Progressions
Free · Designed for iPad. Not verified for macOS.
The simplest way to build chord progressions and learn how to play them.
Build chord progressions that actually work.
All 7 Diatonic Chords, Color-Coded
Pick a key and instantly see every chord available to you, grouped by harmonic function. Know what fits, know why it fits — and make better creative decisions faster.
Chord Voicing Tools
Go beyond basic triads. Add extensions (7ths, 9ths), flip inversions, or borrow from parallel keys to shape exactly the sound you're after. Preview every variation before you commit.
Chord Bank and Chart View
Save up to 8 chords as you build your progression. The piano chart is always there when you need a quick visual reference on how to play for any chord in your progression on a Piano or MIDI Keyboard.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Chart view - piano diagrams for every chord in your bank.
Visual refinements.
Octave alignment has been corrected so highlighted notes always land in the right place.
Chord inversion display is now accurate across all voicing combinations.
Fixed several edge cases across the chord and voicing panels..
The developer, Alex Amayo, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Alex Amayo
- Size
- 46.4 MB
- Category
- Music
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPad
Requires iPadOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Alex Amayo