# O vs SmileScan （スマイルスキャン）

The clearest difference is in-app purchases: SmileScan （スマイルスキャン） at none against O's 2. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. O sells 2 in-app purchases, starting at $2.99 per month. SmileScan （スマイルスキャン） asks for nothing beyond the download.

O ships an update every 2 weeks, SmileScan （スマイルスキャン） every 3 weeks. Both last shipped on September 9, 2026.

## The numbers

| Metric | O | SmileScan （スマイルスキャン） |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 weeks |
| Size | 49 MB | 104 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 17+ |
| Developer | [株式会社モアソンジャパン](https://appshunter.io/developer/496417616) | [Doctorbook](https://appshunter.io/developer/1504193261) |

## What reviewers say

### O

[App page](https://appshunter.io/ios/app/o-trainer/id6443540195)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアムプラン（１ヶ月） | $2.99 | per month |
| 広告を削除 | $2.99 | one-time |


### SmileScan （スマイルスキャン）

[App page](https://appshunter.io/ios/app/smilescan/id6740604473)

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

**In-app purchases:** none


## Frequently asked questions

### Is O free?

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

### Is SmileScan （スマイルスキャン） free?

SmileScan （スマイルスキャン） is free to download, with no in-app purchases.

### Do O or SmileScan （スマイルスキャン） have ads?

Neither O nor SmileScan （スマイルスキャン） shows ads.

### Which is updated more often, O or SmileScan （スマイルスキャン）?

O ships an update every 2 weeks, and SmileScan （スマイルスキャン） every 3 weeks. Most recently, O was updated on September 9, 2026 and SmileScan （スマイルスキャン） on September 9, 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.*