# THE CURVE vs 記憶KEEPER

The clearest difference is ads: 記憶KEEPER at none against THE CURVE's shown. 記憶KEEPER also leads on update cadence (every 3 days vs fortnightly). On price, in-app purchases, device support and iOS requirement there is nothing between them.

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

THE CURVE ships an update fortnightly, 記憶KEEPER every 3 days. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | THE CURVE | 記憶KEEPER |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/the-curve-flashcards/id6535682630/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | **Every 3 days** |
| Monetization | Ad-supported | — |
| Size | 49 MB | 4 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Yoshinori Tsuchiya](https://appshunter.io/developer/1685599976) | [nao watanabe](https://appshunter.io/developer/1896686911) |

## What reviewers say

### THE CURVE

[App page](https://appshunter.io/ios/app/the-curve-flashcards/id6535682630)

Create custom flashcards for efficient learning based on the forgetting curve. Review challenging material strategically to optimize memory retention for various subjects and exams.

**Highlights:** Create custom flashcards, Supports language learning and exam prep, Learning modes based on forgetting curve, Review challenging cards intensively, Track learning levels with progress indicators

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

**In-app purchases:** none


### 記憶KEEPER

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is THE CURVE free?

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

### Is 記憶KEEPER free?

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

### Do THE CURVE or 記憶KEEPER have ads?

THE CURVE shows ads; 記憶KEEPER does not.

### Which is updated more often, THE CURVE or 記憶KEEPER?

THE CURVE ships an update fortnightly, and 記憶KEEPER every 3 days. Most recently, THE CURVE was updated on November 2, 2026 and 記憶KEEPER on October 31, 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.*