# カクヨムViewer vs BUKU Codebook

The clearest difference is in-app purchases: カクヨムViewer at none against BUKU Codebook's 3. カクヨムViewer also leads on update cadence (fortnightly vs monthly). BUKU Codebook's advantage is iOS requirement (13.0 vs 18.6). On price, ads and device support there is nothing between them.

Both are free to download. BUKU Codebook sells 3 in-app purchases, starting at $9.99 per month. カクヨムViewer asks for nothing beyond the download.

カクヨムViewer ships an update fortnightly, BUKU Codebook monthly. The most recent releases landed on October 11, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | カクヨムViewer | BUKU Codebook |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (49 ratings)](https://appshunter.io/ios/app/viewer-web/id1081762516/reviews)** | — |
| Number of ratings | **49** | — |
| Positive reviews | 12.5% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Fortnightly** | Monthly |
| Monetization | Free with in-app purchases | — |
| Size | 56 MB | 44 MB |
| Requires iOS | 18.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 12+ | 9+ |
| Developer | [KADOKAWA CORPORATION](https://appshunter.io/developer/986639480) | [合同会社EMYSTI](https://appshunter.io/developer/1884005558) |

## What reviewers say

### カクヨムViewer

[App page](https://appshunter.io/ios/app/viewer-web/id1081762516)

This app provides access to a vast collection of web novels and light novels, including original works and fanfiction. Users can customize their reading experience with adjustable backgrounds and fonts, and enjoy offline reading. It also offers a subscription service for exclusive new titles.

**Highlights:** Browse novels by genre, Follow favorite novels, Offline reading support, Customizable reader settings, Notifications for new chapters, Support original and fanfiction works

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

**In-app purchases:** none


### BUKU Codebook

[App page](https://appshunter.io/ios/app/buku-codebook/id6784887188)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月額メンバーシップ | $9.99 | per month |
| 発起人書庫スロット +1 | $0.99 | one-time |
| 永久広告削除 | $3.99 | one-time |


## Frequently asked questions

### Is カクヨムViewer free?

カクヨムViewer is free to download, with no in-app purchases.

### Is BUKU Codebook free?

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

### Do カクヨムViewer or BUKU Codebook have ads?

Both カクヨムViewer and BUKU Codebook show ads.

### Which is updated more often, カクヨムViewer or BUKU Codebook?

カクヨムViewer ships an update fortnightly, and BUKU Codebook monthly. Most recently, カクヨムViewer was updated on October 11, 2026 and BUKU Codebook on October 8, 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.*