# 縦読み vs BookPDF

The clearest difference is update cadence: BookPDF at every 2 days against 縦読み's monthly. 縦読み's advantage is iOS requirement (15.0 vs 18). 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.

縦読み ships an update monthly, BookPDF every 2 days. The most recent releases landed on September 23, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | 縦読み | BookPDF |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 87.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 days** |
| Size | 37 MB | 2 MB |
| Requires iOS | **15.0** | 18 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Kosuke Isobe](https://appshunter.io/developer/1175953239) | [Yuta Sugawara](https://appshunter.io/developer/1867695269) |

## What reviewers say

### 縦読み

[App page](https://appshunter.io/ios/app/id6479632989)

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

**In-app purchases:** none


### BookPDF

[App page](https://appshunter.io/ios/app/bookpdf/id6758102700)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 縦読み free?

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

### Is BookPDF free?

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

### Do 縦読み or BookPDF have ads?

Neither 縦読み nor BookPDF shows ads.

### Which is updated more often, 縦読み or BookPDF?

縦読み ships an update monthly, and BookPDF every 2 days. Most recently, 縦読み was updated on September 23, 2026 and BookPDF on September 25, 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.*