# 色そろばん vs 記憶KEEPER

The clearest difference is price: 記憶KEEPER at Free against 色そろばん's $7.99. 記憶KEEPER also leads on update cadence (every 3 days vs every 26 months). 色そろばん's advantage is iOS requirement (12.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

記憶KEEPER is free to download; 色そろばん costs $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

色そろばん ships an update every 26 months, 記憶KEEPER every 3 days. The most recent releases landed on September 10, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | 色そろばん | 記憶KEEPER |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 26 months | **Every 3 days** |
| Size | 98 MB | 4 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [kei watanabe](https://appshunter.io/developer/1351571003) | [nao watanabe](https://appshunter.io/developer/1896686911) |

## What reviewers say

### 色そろばん

[App page](https://appshunter.io/ios/app/id1351571004)

**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 色そろばん free?

色そろばん costs $7.99, with no in-app purchases.

### Is 記憶KEEPER free?

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

### Do 色そろばん or 記憶KEEPER have ads?

Neither 色そろばん nor 記憶KEEPER shows ads.

### Which is updated more often, 色そろばん or 記憶KEEPER?

色そろばん ships an update every 26 months, and 記憶KEEPER every 3 days. Most recently, 色そろばん was updated on September 10, 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.*