# 読書カレンダー vs ReadMaster

The clearest difference is update cadence: 読書カレンダー at every 8 days against ReadMaster's every 2 months. 読書カレンダー also leads on iOS requirement (15.0 vs 18.5). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 読書カレンダー sells 4 in-app purchases, starting at $2.99 per month and ReadMaster sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

読書カレンダー ships an update every 8 days, ReadMaster every 2 months. The most recent releases landed on September 30, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | 読書カレンダー | ReadMaster |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 8 days** | Every 2 months |
| Monetization | Freemium | — |
| Size | 50 MB | 95 MB |
| Requires iOS | **15.0** | 18.5 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Manabu TsuTsui](https://appshunter.io/developer/1745681573) | [TEMMA SUZUKI](https://appshunter.io/developer/1846787341) |

## What reviewers say

### 読書カレンダー

[App page](https://appshunter.io/ios/app/id6746183055)

This app helps book lovers beautifully record and manage their reading history using a calendar view. Easily register books via barcode scan or title search, and organize your digital bookshelf. Premium features offer advanced reading progress visualization and goal tracking.

**Highlights:** Calendar-style reading log, Visual book history on calendar, Barcode book registration, Digital bookshelf management, Reading progress visualization, Reading goal setting

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月額サブスクリプション | $2.99 | per month |
| 年割サブスクリプション | $22.99 | per year |
| 買い切りプラン(24時間限定) | $14.99 | one-time |
| 買い切りプラン | $29.99 | one-time |


### ReadMaster

[App page](https://appshunter.io/ios/app/readmaster-reading-tracker/id6754158071)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ReadMaster Plus 1ヶ月 | $0.99 | per month |
| ReadMaster Plus 6ヶ月 | $5.99 | per 6 months |


## Frequently asked questions

### Is 読書カレンダー free?

読書カレンダー is free to download, with in-app purchases available.

### Is ReadMaster free?

ReadMaster is free to download, with in-app purchases available.

### Do 読書カレンダー or ReadMaster have ads?

Neither 読書カレンダー nor ReadMaster shows ads.

### Which is updated more often, 読書カレンダー or ReadMaster?

読書カレンダー ships an update every 8 days, and ReadMaster every 2 months. Most recently, 読書カレンダー was updated on September 30, 2026 and ReadMaster on October 10, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*