# ことせかい vs shelff

The clearest difference is price: ことせかい at Free against shelff's $6.99. ことせかい also leads on device support (4 vs 2) and iOS requirement (15.0 vs 17.0). shelff's advantage is update cadence (every 4 days vs every 3 weeks). On review sentiment, ads and in-app purchases there is nothing between them.

ことせかい is free to download; shelff costs $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ことせかい ships an update every 3 weeks, shelff every 4 days. The most recent releases landed on October 29, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | ことせかい | shelff |
| --- | --- | --- |
| Price | **Free** | $6.99 |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/id914344185/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 96.3% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 4 days** |
| Monetization | — | Paid |
| Size | 148 MB | 9 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad |
| Age rating | 9+ | 4+ |
| Developer | [Takuji Iimura](https://appshunter.io/developer/914344188) | [Satoshi Kojima](https://appshunter.io/developer/1887157382) |

## What reviewers say

### ことせかい

[App page](https://appshunter.io/ios/app/id914344185)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support, iPhone Duo support

**In-app purchases:** none


### shelff

[App page](https://appshunter.io/ios/app/shelff-pdf-book-reader/id6760986626)

This app provides a dedicated reading experience for PDF documents stored in iCloud. It offers robust organization tools, including folders, tags, and collections, along with a full-text search capability. Users can also manage PDF metadata and highlight content with comments.

**Highlights:** iCloud PDF management, Organize with folders and tags, Full-text search, Highlighting with comments, Metadata editing, Customizable reading layouts

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

**In-app purchases:** none


## Frequently asked questions

### Is ことせかい free?

ことせかい is free to download, with no in-app purchases.

### Is shelff free?

shelff costs $6.99, with no in-app purchases.

### Do ことせかい or shelff have ads?

Neither ことせかい nor shelff shows ads.

### Which is updated more often, ことせかい or shelff?

ことせかい ships an update every 3 weeks, and shelff every 4 days. Most recently, ことせかい was updated on October 29, 2026 and shelff on October 28, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*