# 読書管理CatBook vs 歴代天皇おぼえまSHOW！

The clearest difference is in-app purchases: 読書管理CatBook at none against 歴代天皇おぼえまSHOW！'s 1. 読書管理CatBook also leads on iOS requirement (12.0 vs 14.5). 歴代天皇おぼえまSHOW！'s advantage is update cadence (daily vs monthly) and review sentiment (100% vs 75%). On price, ads and device support there is nothing between them.

Both are free to download. 歴代天皇おぼえまSHOW！ sells 1 one-off in-app purchase. 読書管理CatBook asks for nothing beyond the download.

読書管理CatBook ships an update monthly, 歴代天皇おぼえまSHOW！ daily. The most recent releases landed on October 7, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | 読書管理CatBook | 歴代天皇おぼえまSHOW！ |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 75.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Monthly | **Daily** |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 82 MB | 14 MB |
| Requires iOS | **12.0** | 14.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sumie Watanabe](https://appshunter.io/developer/1349237972) | [Akira Fujisawa](https://appshunter.io/developer/1533514621) |

## What reviewers say

### 読書管理CatBook

[App page](https://appshunter.io/ios/app/catbook/id1565953416)

Track your reading progress, including title, author, and reading status. Organize books by series or magazine issues and get reminders for library book returns. Easily add books via ISBN scan.

**Highlights:** Record title, author, volume, notes, and reading progress, Organize books by series or magazine issues, Library mode with return date reminders, ISBN search with camera scanning, Save data to CSV, Calendar view for reading records

**Features:** macOS Compatibility

**In-app purchases:** none


### 歴代天皇おぼえまSHOW！

[App page](https://appshunter.io/ios/app/show/id1668527121)

This app helps users memorize the names of past emperors. It's primarily designed for students preparing for exams but is also useful for anyone wanting to acquire general knowledge. Various modes are available to suit different learning styles.

**Highlights:** Memorize past emperors, Targeted for exam preparation, Acquire general knowledge, Multiple learning modes, Error correction reporting

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告非表示 | $2.99 | one-time |


## Frequently asked questions

### Is 読書管理CatBook free?

読書管理CatBook is free to download, with no in-app purchases.

### Is 歴代天皇おぼえまSHOW！ free?

歴代天皇おぼえまSHOW！ is free to download, with in-app purchases available.

### Do 読書管理CatBook or 歴代天皇おぼえまSHOW！ have ads?

Both 読書管理CatBook and 歴代天皇おぼえまSHOW！ show ads.

### Which is updated more often, 読書管理CatBook or 歴代天皇おぼえまSHOW！?

読書管理CatBook ships an update monthly, and 歴代天皇おぼえまSHOW！ daily. Most recently, 読書管理CatBook was updated on October 7, 2026 and 歴代天皇おぼえまSHOW！ on October 23, 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.*