# Key Lens — Create, play and learn chords.

> Create, play and learn chords. (iPhone/iPad app by Alex Amayo.)

- Source: https://appshunter.io/ios/app/key-lens/id6761850903 (this page in markdown: same URL + `.md`)
- Developer: [Alex Amayo](https://appshunter.io/developer/1835625743)
- Category: Music, Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.4 · 64 MB
- Languages: American English
- Released: 2026-04-10
- Data updated: 2026-09-29
- User reviews in markdown: https://appshunter.io/ios/app/key-lens/id6761850903/reviews.md

## What is Key Lens?

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.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Midi Output | $9.99 | one-time |



## Version history (last 5 releases)

### 1.4 — 2026-09-22

New and improved UI. 

Decoupled features for a better user experience.

Added bass section to remote page with chord follow features.

### 1.3 — 2026-06-25

Improved general UI and chart view.
Introduced two octave Key playing zone.
MIDI connection over Bluetooth and USB.
Bug fixes and stability improvements.

### 1.2 — 2026-04-28

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..

### 1.1 — 2026-04-14

• Chord function colors — tonic, subdominant, and dominant                                     
    chords are now color-coded so you can see harmonic                                           
    movement at a glance                              
  • Chord legend — tap the info icon to learn what each                                          
    color means                                                                                  
  • Improved chord voicings — smarter inversion options                                          
    and correctly ordered extension symbols                                                      
  • Bug fixes and music theory improvements

### 1.0 — 2026-04-10

No release notes.

## Apps similar to Key Lens

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Start Playing](https://appshunter.io/ios/app/start-playing/id6757209773) | 5.0 (1) | Free | Music |
| [Nathan's Music Trainer](https://appshunter.io/ios/app/nathans-music-trainer/id6769324500) | — | Free | Music |
| [Ikatomape Midigene](https://appshunter.io/ios/app/ikatomape-midigene/id6758357465) | — | Free | Music |
| [Harmonius](https://appshunter.io/ios/app/harmonius/id6499569641) | — | Free | Music |
| [Chords Weaver](https://appshunter.io/ios/app/chords-weaver/id6787991938) | — | Free | Music |
| [Heard It All](https://appshunter.io/ios/app/heard-it-all/id6746056385) | 5.0 (21) | Free | Music |

## More apps by Alex Amayo

- [VIP Genie](https://appshunter.io/ios/app/vip-genie/id6753199991)

All apps by Alex Amayo: https://appshunter.io/developer/1835625743

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-29.*