# CLASS_SHEET vs 忘却曲線

The clearest difference is update cadence: 忘却曲線 at every 5 days against CLASS_SHEET's every 15 months. CLASS_SHEET's advantage is iOS requirement (9.3 vs 15.5). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

CLASS_SHEET ships an update every 15 months, 忘却曲線 every 5 days. The most recent releases landed on November 7, 2026 and November 13, 2026 respectively.

## The numbers

| Metric | CLASS_SHEET | 忘却曲線 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 5 days** |
| Size | 30 MB | 95 MB |
| Requires iOS | **9.3** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Masayo Nitta](https://appshunter.io/developer/1550764703) | [Mitsuo Watabe](https://appshunter.io/developer/6788107915) |

## What reviewers say

### CLASS_SHEET

[App page](https://appshunter.io/ios/app/class-sheet/id1550764701)

**Features:** macOS Compatibility

**In-app purchases:** none


### 忘却曲線

[App page](https://appshunter.io/ios/app/id6799765993)

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

**In-app purchases:** none


## Frequently asked questions

### Is CLASS_SHEET free?

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

### Is 忘却曲線 free?

忘却曲線 is free to download, with no in-app purchases.

### Do CLASS_SHEET or 忘却曲線 have ads?

Neither CLASS_SHEET nor 忘却曲線 shows ads.

### Which is updated more often, CLASS_SHEET or 忘却曲線?

CLASS_SHEET ships an update every 15 months, and 忘却曲線 every 5 days. Most recently, CLASS_SHEET was updated on November 7, 2026 and 忘却曲線 on November 13, 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.*