Key Lens
Create, play and learn chords.
Free · In-App Purchases · Designed for iPad. Not verified for macOS.
Music theory made easy!
Pick a key, explore common chord progressions or build your own!
Build harmony with chords, bass and melody all locked to your scale.
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.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
New and improved UI.
Decoupled features for a better user experience.
Added bass section to remote page with chord follow features.
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
- 67.2 MB
- Category
- Music
- Compatibility
Requires iOS 16.4 or later.
- iPhone
Requires iOS 16.4 or later. - iPad
Requires iPadOS 16.4 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+
- In-App Purchases
Yes
- Midi Output USD 9.99
- Copyright
- © 2026 Alex Amayo