# 우송도서관 vs 북이오

우송도서관 and 북이오 are too close to call on the numbers: across 2 compared parameters — in-app purchases and iOS requirement among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

## The numbers

| Metric | 우송도서관 | 북이오 |
| --- | --- | --- |
| Price | **Free** | — |
| Rating | — | **[2.3 (11 ratings)](https://appshunter.io/ios/app/bukio/id6504741320/reviews)** |
| Number of ratings | — | **11** |
| Positive reviews | — | 25.0% of reviews |
| In-app purchases | No | No |
| Ads | No | — |
| Update frequency | Every 3 months | — |
| Monetization | — | Free |
| Size | 35 MB | 3 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | **iPhone** | — |
| Age rating | 4+ | 4+ |
| Developer | [LibTech Co.](https://appshunter.io/developer/1099043485) | [Buk.io, Inc.](https://appshunter.io/developer/1056002582) |

## What reviewers say

### 우송도서관

[App page](https://appshunter.io/ios/app/id1464639304)

**Features:** Vision Pro support

**In-app purchases:** none


### 북이오

[App page](https://appshunter.io/ios/app/bukio/id6504741320)

This app offers two reading modes: 'Solo Reading' for focused individual study and 'Group Reading' for real-time sharing of reading progress with others. Enhance your experience with expert commentary and collaborative note-taking.

**Highlights:** Solo and Group Reading Modes, Real-time progress sharing, Highlight and note sharing, Expert commentary integration, Group creation and management, Pen support for PDF annotation

**In-app purchases:** none


## Frequently asked questions

### Is 우송도서관 free?

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

### Is 북이오 free?

Pricing for 북이오 is not currently listed on the App Store.

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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.*