# 読書管理ビブリア vs カクヨムViewer

読書管理ビブリア and カクヨムViewer both sit at 4.8 stars, but that hides the real split: 95% of 読書管理ビブリア's written reviews are positive against 13% of カクヨムViewer's. カクヨムViewer's advantage is in-app purchases (none vs 1) and update cadence (fortnightly vs every 2 months). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. 読書管理ビブリア sells 1 in-app purchase, starting at $4.99 per month. カクヨムViewer asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.8 for 読書管理ビブリア against 4.7 for カクヨムViewer. Both are backed by a comparable volume of ratings — 24 and 48 respectively. Written reviews are what separate them: 95% of 読書管理ビブリア's written reviews are positive against 13% of カクヨムViewer's.

読書管理ビブリア ships an update every 2 months, カクヨムViewer fortnightly. The most recent releases landed on September 22, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | 読書管理ビブリア | カクヨムViewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (24 ratings)](https://appshunter.io/ios/app/id894377244/reviews)** | [4.7 (48 ratings)](https://appshunter.io/ios/app/viewer-web/id1081762516/reviews) |
| Number of ratings | 24 | **48** |
| Positive reviews | **95.5% of reviews** | 12.5% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | — | Free with in-app purchases |
| Size | 32 MB | 55 MB |
| Requires iOS | **17.0** | 18.6 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 12+ |
| Developer | [Keisuke Uchida](https://appshunter.io/developer/584870453) | [KADOKAWA CORPORATION](https://appshunter.io/developer/986639480) |

## What reviewers say

### 読書管理ビブリア

[App page](https://appshunter.io/ios/app/id894377244)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ビブリアクラブ | $4.99 | per month |


### 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


## Frequently asked questions

### Is 読書管理ビブリア free?

読書管理ビブリア is free to download, with in-app purchases available.

### Is カクヨムViewer free?

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

### Which has better reviews, 読書管理ビブリア or カクヨムViewer?

読書管理ビブリア is rated higher. 読書管理ビブリア averages 4.8 out of 5 from 24 ratings, while カクヨムViewer averages 4.7 from 48 ratings.

### Do 読書管理ビブリア or カクヨムViewer have ads?

Both 読書管理ビブリア and カクヨムViewer show ads.

### Which is updated more often, 読書管理ビブリア or カクヨムViewer?

読書管理ビブリア ships an update every 2 months, and カクヨムViewer fortnightly. Most recently, 読書管理ビブリア was updated on September 22, 2026 and カクヨムViewer 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.*