# 서울도서관공식앱 vs U

The clearest difference is rating: U at 3.8 against 서울도서관공식앱's 1.4. U also leads on review sentiment (29% vs 11%) and iOS requirement (13.0 vs 15.0). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

U holds the better App Store score, 3.8 against 1.4. Both are backed by a comparable volume of ratings — 13 and 5 respectively. Written reviews point the same way: 11% of 서울도서관공식앱's written reviews are positive against 29% of U's.

서울도서관공식앱 ships an update every 2 months, U every 3 months. Both last shipped on October 29, 2026.

## The numbers

| Metric | 서울도서관공식앱 | U |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.4 (13 ratings)](https://appshunter.io/ios/app/id777428688/reviews) | **[3.8 (5 ratings)](https://appshunter.io/ios/app/u-knou/id1346391846/reviews)** |
| Number of ratings | **13** | 5 |
| Positive reviews | 10.7% of reviews | **29.1% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | — | Free |
| Size | 10 MB | 4 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Seoul Metropolitan Government](https://appshunter.io/developer/444447999) | [Korea National Open University](https://appshunter.io/developer/504499080) |

## What reviewers say

### 서울도서관공식앱

[App page](https://appshunter.io/ios/app/id777428688)

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

**In-app purchases:** none


### U

[App page](https://appshunter.io/ios/app/u-knou/id1346391846)

Access over 1000 online courses from Korea National Open University, suitable for both students and lifelong learners. Enjoy a seamless learning experience with features like video lecture downloads and personalized notifications.

**Highlights:** 1000+ diverse online courses, PC-like learning environment, Video lecture downloads, Personalized learning schedules, Course-related notifications, Access for students and general public

**In-app purchases:** none


## Frequently asked questions

### Is 서울도서관공식앱 free?

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

### Is U free?

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

### Which has better reviews, 서울도서관공식앱 or U?

U is rated higher. 서울도서관공식앱 averages 1.4 out of 5 from 13 ratings, while U averages 3.8 from 5 ratings.

### Do 서울도서관공식앱 or U have ads?

Neither 서울도서관공식앱 nor U shows ads.

### Which is updated more often, 서울도서관공식앱 or U?

서울도서관공식앱 ships an update every 2 months, and U every 3 months. Most recently, 서울도서관공식앱 was updated on October 29, 2026 and U on October 29, 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.*