# LeftRightDiary vs Book Isle

The clearest difference is price: LeftRightDiary at Free against Book Isle's $0.99. Book Isle's advantage is review sentiment (89% vs 50%) and update cadence (weekly vs monthly). On rating, ratings volume, ads and in-app purchases there is nothing between them.

LeftRightDiary is free to download; Book Isle costs $0.99 up front. LeftRightDiary sells 3 one-off in-app purchases and Book Isle sells 3 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for LeftRightDiary against 5.0 for Book Isle. Both are backed by a comparable volume of ratings — 1 and 2 respectively. Written reviews are what separate them: 50% of LeftRightDiary's written reviews are positive against 89% of Book Isle's.

LeftRightDiary ships an update monthly, Book Isle weekly. Both last shipped on October 24, 2026.

## The numbers

| Metric | LeftRightDiary | Book Isle |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/leftrightdiary/id6744639565/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/book-isle/id6766198898/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | 50.0% of reviews | **89.2% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 80 MB | 50 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 9+ |
| Developer | [候军 袁](https://appshunter.io/developer/1649023261) | [Anyi County Bingzhiyi Trading Co., Ltd.](https://appshunter.io/developer/1544707793) |

## What reviewers say

### LeftRightDiary

[App page](https://appshunter.io/ios/app/leftrightdiary/id6744639565)

This app allows you to record life's moments using text and images, with support for Markdown editing. It prioritizes privacy by storing all data locally on your device and offers various ways to review past entries.

**Highlights:** Markdown and Rich Text editing, Mixed text and image layout, Heatmap and Calendar views, Random memory recall, Local data storage, WebDAV and Alibaba Cloud Disk sync

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade to PRO | $3.99 | one-time |
| 请作者吃大餐 | $9.99 | one-time |
| 大力支持 | $29.99 | one-time |


### Book Isle

[App page](https://appshunter.io/ios/app/book-isle/id6766198898)

This app allows you to connect to your personal NAS, WebDAV, SMB, OPDS, or Calibre library to import, browse, search, download, and read local and remote books. It supports a wide range of file formats and offers a robust local reading experience with features like full-text search and highlighting.

**Highlights:** Connect to NAS, WebDAV, SMB, OPDS, Calibre, Import and manage multiple book formats, Full-text search and bookmarking, Remote reading and downloading, Private synchronization of reading progress, Face ID app lock for privacy

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly membership | $0.99 | per month |
| Annual Membership | $2.99 | per year |
| Permanent member | $7.99 | one-time |


## Frequently asked questions

### Is LeftRightDiary free?

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

### Is Book Isle free?

Book Isle costs $0.99, and also offers in-app purchases.

### Which has better reviews, LeftRightDiary or Book Isle?

LeftRightDiary and Book Isle are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.

### Do LeftRightDiary or Book Isle have ads?

Neither LeftRightDiary nor Book Isle shows ads.

### Which is updated more often, LeftRightDiary or Book Isle?

LeftRightDiary ships an update monthly, and Book Isle weekly. Most recently, LeftRightDiary was updated on October 24, 2026 and Book Isle on October 24, 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.*