# Diatonic Chords by Key vs Ear training

The clearest difference is in-app purchases: Ear training at none against Diatonic Chords by Key's 1. Diatonic Chords by Key's advantage is ads (none vs shown) and update cadence (every 5 days vs every 8 months). On price and device support there is nothing between them.

Both are free to download. Diatonic Chords by Key sells 1 one-off in-app purchase. Ear training asks for nothing beyond the download.

Diatonic Chords by Key ships an update every 5 days, Ear training every 8 months. The most recent releases landed on October 25, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Diatonic Chords by Key | Ear training |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (248 ratings)](https://appshunter.io/ios/app/ear-training-notes-and-chords/id1578165399/reviews)** |
| Number of ratings | — | **248** |
| Positive reviews | — | 32.6% of reviews |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 5 days** | Every 8 months |
| Monetization | — | Ad-supported |
| Size | 36 MB | 41 MB |
| Requires iOS | **13.6** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Mateus Polonini Cardoso](https://appshunter.io/developer/1530866903) | [Alexey Ovod](https://appshunter.io/developer/1545142178) |

## What reviewers say

### Diatonic Chords by Key

[App page](https://appshunter.io/ios/app/diatonic-chords-by-key/id1533977611)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Campo Harmônico Pro | $2.99 | one-time |


### Ear training

[App page](https://appshunter.io/ios/app/ear-training-notes-and-chords/id1578165399)

Develop perfect pitch and recognize notes, chords, and melodies by ear. This app offers a series of exercises to train your aural skills, with explanations and hints to help you learn at your own pace. Improve your ability to play along with songs or guess melodies.

**Highlights:** Develop perfect pitch, Recognize notes and chords, Identify intervals and chord progressions, Learn major and minor scales, Instrument-specific practice, Hint function

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Diatonic Chords by Key free?

Diatonic Chords by Key is free to download, with in-app purchases available.

### Is Ear training free?

Ear training is free to download, with no in-app purchases.

### Do Diatonic Chords by Key or Ear training have ads?

Ear training shows ads; Diatonic Chords by Key does not.

### Which is updated more often, Diatonic Chords by Key or Ear training?

Diatonic Chords by Key ships an update every 5 days, and Ear training every 8 months. Most recently, Diatonic Chords by Key was updated on October 25, 2026 and Ear training on November 3, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*