# U vs 수학비서

The clearest difference is review sentiment: 수학비서 at 100% against U's 50%. 수학비서 also leads on update cadence (every 6 days vs every 4 months). U's advantage is iOS requirement (12.3 vs 15.6). On price, ads, in-app purchases and device support there is nothing between them.

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

U ships an update every 4 months, 수학비서 every 6 days. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | U | 수학비서 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 6 days** |
| Monetization | Free | — |
| Size | 8 MB | 80 MB |
| Requires iOS | **12.3** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [MIN HO KIM](https://appshunter.io/developer/582570599) | [포스트매스](https://appshunter.io/developer/1785605543) |

## What reviewers say

### U

[App page](https://appshunter.io/ios/app/u-class-student/id1472703543)

This app allows teachers to monitor student devices in real-time, share their PC screen, and facilitate file transfers. It also includes annotation tools and group management features for collaborative learning.

**Highlights:** Real-time student device monitoring, Teacher PC screen sharing, File transfer between students and teachers, Annotation and whiteboard functionality, Student group management, Remote control of student devices

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

**In-app purchases:** none


### 수학비서

[App page](https://appshunter.io/ios/app/id6739489194)

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

**In-app purchases:** none


## Frequently asked questions

### Is U free?

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

### Is 수학비서 free?

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

### Do U or 수학비서 have ads?

Neither U nor 수학비서 shows ads.

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

U ships an update every 4 months, and 수학비서 every 6 days. Most recently, U was updated on November 3, 2026 and 수학비서 on November 4, 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.*