# Data vs KokuDoku：読書メモ、管理、活用

The clearest difference is update cadence: KokuDoku：読書メモ、管理、活用 at weekly against Data's every 2 months. Data's advantage is iOS requirement (17.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

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

Data ships an update every 2 months, KokuDoku：読書メモ、管理、活用 weekly. The most recent releases landed on September 20, 2026 and August 11, 2026 respectively.

## The numbers

| Metric | Data | KokuDoku：読書メモ、管理、活用 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Size | 59 MB | 28 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [WingArc1st Inc.](https://appshunter.io/developer/895697087) | [Chiaki Kobayashi](https://appshunter.io/developer/1865034949) |

## What reviewers say

### Data

[App page](https://appshunter.io/ios/app/data-jig/id6445971110)

**Features:** Vision Pro support

**In-app purchases:** none


### KokuDoku：読書メモ、管理、活用

[App page](https://appshunter.io/ios/app/kokudoku/id6757169073)

**In-app purchases:** none


## Frequently asked questions

### Is Data free?

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

### Is KokuDoku：読書メモ、管理、活用 free?

KokuDoku：読書メモ、管理、活用 is free to download, with no in-app purchases.

### Do Data or KokuDoku：読書メモ、管理、活用 have ads?

Neither Data nor KokuDoku：読書メモ、管理、活用 shows ads.

### Which is updated more often, Data or KokuDoku：読書メモ、管理、活用?

Data ships an update every 2 months, and KokuDoku：読書メモ、管理、活用 weekly. Most recently, Data was updated on September 20, 2026 and KokuDoku：読書メモ、管理、活用 on August 11, 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.*