# Oei! vs Sudayku

The clearest difference is in-app purchases: Sudayku at none against Oei!'s 8. Sudayku also leads on ads (none vs shown) and update cadence (every 3 days vs every 9 days). Oei!'s advantage is iOS requirement (15.0 vs 17.0). On price and device support there is nothing between them.

Both are free to download. Oei! sells 8 one-off in-app purchases. Sudayku asks for nothing beyond the download.

Oei! ships an update every 9 days, Sudayku every 3 days. The most recent releases landed on October 8, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Oei! | Sudayku |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 9 days | **Every 3 days** |
| Size | 344 MB | 5 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Lee Darcy](https://appshunter.io/developer/1224148622) | [Krijn Haasnoot](https://appshunter.io/developer/1068421784) |

## What reviewers say

### Oei!

[App page](https://appshunter.io/ios/app/oei/id1604012627)

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Keith Talbot Pack | $0.99 | one-time |
| Daniel Torres Pack | $0.99 | one-time |
| Fishbowl pack | $0.99 | one-time |
| Glenn Southern Pack | $0.99 | one-time |
| Brian J Read Pack | $0.99 | one-time |
| Physics Pack | $0.99 | one-time |
| Cris Palomino Pack | $0.99 | one-time |
| Disable ads | $2.99 | one-time |


### Sudayku

[App page](https://appshunter.io/ios/app/sudayku/id6797092684)

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

**In-app purchases:** none


## Frequently asked questions

### Is Oei! free?

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

### Is Sudayku free?

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

### Do Oei! or Sudayku have ads?

Oei! shows ads; Sudayku does not.

### Which is updated more often, Oei! or Sudayku?

Oei! ships an update every 9 days, and Sudayku every 3 days. Most recently, Oei! was updated on October 8, 2026 and Sudayku on October 28, 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.*