# Diatonic Chords by Key vs Só Cifra

The clearest difference is in-app purchases: Só Cifra at none against Diatonic Chords by Key's 1. Diatonic Chords by Key's advantage is update cadence (every 5 days vs fortnightly) and iOS requirement (13.6 vs 16.6). On price, ads and device support there is nothing between them.

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

Diatonic Chords by Key ships an update every 5 days, Só Cifra fortnightly. The most recent releases landed on October 25, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Diatonic Chords by Key | Só Cifra |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 days** | Fortnightly |
| Size | 36 MB | 2 MB |
| Requires iOS | **13.6** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [Mateus Polonini Cardoso](https://appshunter.io/developer/1530866903) | [Adriano Krauthein](https://appshunter.io/developer/1543075393) |

## 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 |


### Só Cifra

[App page](https://appshunter.io/ios/app/so-cifra/id6760509399)

**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 Só Cifra free?

Só Cifra is free to download, with no in-app purchases.

### Do Diatonic Chords by Key or Só Cifra have ads?

Neither Diatonic Chords by Key nor Só Cifra shows ads.

### Which is updated more often, Diatonic Chords by Key or Só Cifra?

Diatonic Chords by Key ships an update every 5 days, and Só Cifra fortnightly. Most recently, Diatonic Chords by Key was updated on October 25, 2026 and Só Cifra on November 5, 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.*