# 記憶KEEPER vs 忘却曲線

記憶KEEPER and 忘却曲線 are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

記憶KEEPER ships an update every 3 days, 忘却曲線 every 5 days. The most recent releases landed on November 5, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | 記憶KEEPER | 忘却曲線 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 5 days |
| Size | 4 MB | 94 MB |
| Requires iOS | **15.0** | 15.5 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [nao watanabe](https://appshunter.io/developer/1896686911) | [Mitsuo Watabe](https://appshunter.io/developer/6788107915) |

## What reviewers say

### 記憶KEEPER

[App page](https://appshunter.io/ios/app/keeper/id6769772312)

**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 記憶KEEPER free?

記憶KEEPER 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 記憶KEEPER or 忘却曲線 have ads?

Neither 記憶KEEPER nor 忘却曲線 shows ads.

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

記憶KEEPER ships an update every 3 days, and 忘却曲線 every 5 days. Most recently, 記憶KEEPER was updated on November 5, 2026 and 忘却曲線 on November 6, 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.*