# RHYTHM DELAY vs IDOUDO

The clearest difference is in-app purchases: RHYTHM DELAY at none against IDOUDO's 4. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. IDOUDO sells 4 one-off in-app purchases. RHYTHM DELAY asks for nothing beyond the download.

## The numbers

| Metric | RHYTHM DELAY | IDOUDO |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Size | 6 MB | 2 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Toshio Nagayoshi](https://appshunter.io/developer/1884526096) | [Kosuke Mawatari](https://appshunter.io/developer/1489564137) |

## What reviewers say

### RHYTHM DELAY

[App page](https://appshunter.io/ios/app/rhythm-delay/id6760449838)

**Features:** macOS Compatibility

**In-app purchases:** none


### IDOUDO

[App page](https://appshunter.io/ios/app/idoudo-movable-do-solfege/id6804583806)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Keys: 1 Note | $1.99 | one-time |
| Unlock All Keys: 2 Notes | $1.99 | one-time |
| Unlock All Keys: 1 Triad | $1.99 | one-time |
| Unlock Keys: 1 Seventh Chord | $1.99 | one-time |


## Frequently asked questions

### Is RHYTHM DELAY free?

RHYTHM DELAY is free to download, with no in-app purchases.

### Is IDOUDO free?

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

### Do RHYTHM DELAY or IDOUDO have ads?

Neither RHYTHM DELAY nor IDOUDO shows ads.

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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.*