# 理解度で復習する単語帳 vs 記憶KEEPER

The clearest difference is iOS requirement: 記憶KEEPER at 15.0 against 理解度で復習する単語帳'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.

理解度で復習する単語帳 ships an update every 5 days, 記憶KEEPER every 3 days. The most recent releases landed on September 8, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | 理解度で復習する単語帳 | 記憶KEEPER |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 days | **Every 3 days** |
| Monetization | Free | — |
| Size | 5 MB | 4 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Tsubasa Sakamoto](https://appshunter.io/developer/1865950668) | [nao watanabe](https://appshunter.io/developer/1896686911) |

## What reviewers say

### 理解度で復習する単語帳

[App page](https://appshunter.io/ios/app/moo-anki/id6757971165)

This app uses an input-based learning method where users write answers and compare them to model answers. It automatically adjusts review intervals based on a three-level understanding assessment, making it ideal for memorizing vocabulary and technical terms efficiently.

**Highlights:** Input-based learning, Compare answers to model solutions, Three-level understanding assessment, Automatic review scheduling, Supports descriptive questions

**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 理解度で復習する単語帳 free?

理解度で復習する単語帳 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 理解度で復習する単語帳 or 記憶KEEPER have ads?

Neither 理解度で復習する単語帳 nor 記憶KEEPER shows ads.

### Which is updated more often, 理解度で復習する単語帳 or 記憶KEEPER?

理解度で復習する単語帳 ships an update every 5 days, and 記憶KEEPER every 3 days. Most recently, 理解度で復習する単語帳 was updated on September 8, 2026 and 記憶KEEPER on September 20, 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.*