# Clef vs Intonation Training

The clearest difference is update cadence: Clef at every 3 days against Intonation Training's fortnightly. Intonation Training's advantage is iOS requirement (15.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Clef sells 2 one-off in-app purchases and Intonation Training sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Clef ships an update every 3 days, Intonation Training fortnightly. The most recent releases landed on October 10, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Clef | Intonation Training |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Fortnightly |
| Size | 67 MB | 37 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Mel Owen](https://appshunter.io/developer/1674940249) | [Edmund Trujillo](https://appshunter.io/developer/1862926811) |

## What reviewers say

### Clef

[App page](https://appshunter.io/ios/app/clef-sight-reading-trainer/id6768969191)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Clef | $9.99 | one-time |
| Clef Lifetime | $99.99 | one-time |


### Intonation Training

[App page](https://appshunter.io/ios/app/intonation-training/id6792377954)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Everything | $19.99 | one-time |


## Frequently asked questions

### Is Clef free?

Clef is free to download, with in-app purchases available.

### Is Intonation Training free?

Intonation Training is free to download, with in-app purchases available.

### Do Clef or Intonation Training have ads?

Neither Clef nor Intonation Training shows ads.

### Which is updated more often, Clef or Intonation Training?

Clef ships an update every 3 days, and Intonation Training fortnightly. Most recently, Clef was updated on October 10, 2026 and Intonation Training on October 19, 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.*