# TacticalStudy vs 忘却曲線

The clearest difference is iOS requirement: 忘却曲線 at 15.5 against TacticalStudy's 17.6. On price, update cadence, ads and in-app purchases there is nothing between them.

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

TacticalStudy ships an update every 3 days, 忘却曲線 every 5 days. Both last shipped on October 14, 2026.

## The numbers

| Metric | TacticalStudy | 忘却曲線 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 5 days |
| Size | 6 MB | 94 MB |
| Requires iOS | 17.6 | **15.5** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Yutaka Mochida](https://appshunter.io/developer/1868628237) | [Mitsuo Watabe](https://appshunter.io/developer/6788107915) |

## What reviewers say

### TacticalStudy

[App page](https://appshunter.io/ios/app/tacticalstudy/id6757744235)

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

**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 TacticalStudy free?

TacticalStudy 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 TacticalStudy or 忘却曲線 have ads?

Neither TacticalStudy nor 忘却曲線 shows ads.

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

TacticalStudy ships an update every 3 days, and 忘却曲線 every 5 days. Most recently, TacticalStudy was updated on October 14, 2026 and 忘却曲線 on October 14, 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.*