# Clef Trainer vs Preludia

The clearest difference is update cadence: Clef Trainer at every 4 days against Preludia's every 10 days. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Clef Trainer sells 1 one-off in-app purchase and Preludia sells 10 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Clef Trainer ships an update every 4 days, Preludia every 10 days. The most recent releases landed on October 1, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Clef Trainer | Preludia |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 4 days** | Every 10 days |
| Size | 29 MB | 246 MB |
| Requires iOS | 15.1 | **14.5** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Tuan Anh Nguyen](https://appshunter.io/developer/1702873367) | [Keiji Takeishi](https://appshunter.io/developer/1823484990) |

## What reviewers say

### Clef Trainer

[App page](https://appshunter.io/ios/app/clef-trainer/id6745273935)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Clef Trainer Plus | $0.99 | one-time |


### Preludia

[App page](https://appshunter.io/ios/app/preludia/id6747937187)

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Les Barricades Mystérieuses | $0.99 | one-time |
| Etude in F minor, Op. 25-2 | $0.99 | one-time |
| Preludes: Book I - No. 8 | $0.99 | one-time |
| Golliwogg's Cakewalk | $0.99 | one-time |
| Etude in A minor, Op. 25-11 | $1.49 | one-time |
| Prelude in Db major, Op. 28-15 | $1.49 | one-time |
| Etude Op. 65-3 | $1.49 | one-time |
| Prélude (Tombeau de Couperin) | $1.49 | one-time |
| Aufschwung, Op. 12-2 | $1.99 | one-time |
| Piano Sonata No. 8 - 1st Mov. | $2.99 | one-time |


## Frequently asked questions

### Is Clef Trainer free?

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

### Is Preludia free?

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

### Do Clef Trainer or Preludia have ads?

Both Clef Trainer and Preludia show ads.

### Which is updated more often, Clef Trainer or Preludia?

Clef Trainer ships an update every 4 days, and Preludia every 10 days. Most recently, Clef Trainer was updated on October 1, 2026 and Preludia on October 7, 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.*