# 青空EPUB vs Book Memo

The clearest difference is update cadence: 青空EPUB at daily against Book Memo's every 9 days. 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.

青空EPUB ships an update daily, Book Memo every 9 days. The most recent releases landed on October 16, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | 青空EPUB | Book Memo |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Daily** | Every 9 days |
| Size | 21 MB | 36 MB |
| Requires iOS | **15.1** | 16.4 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Tsutomu Kondo](https://appshunter.io/developer/6807793626) | [Yuki Tagami](https://appshunter.io/developer/6802937847) |

## What reviewers say

### 青空EPUB

[App page](https://appshunter.io/ios/app/epub/id6807793624)

**Features:** macOS Compatibility

**In-app purchases:** none


### Book Memo

[App page](https://appshunter.io/ios/app/book-memo-reading-log-and-notes/id6810904258)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is 青空EPUB free?

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

### Is Book Memo free?

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

### Do 青空EPUB or Book Memo have ads?

Neither 青空EPUB nor Book Memo shows ads.

### Which is updated more often, 青空EPUB or Book Memo?

青空EPUB ships an update daily, and Book Memo every 9 days. Most recently, 青空EPUB was updated on October 16, 2026 and Book Memo on October 12, 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.*