# IU I vs 4em

IU I and 4em are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

## The numbers

| Metric | IU I | 4em |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (13 ratings)](https://appshunter.io/ios/app/iu-i-ke/id1620771639/reviews)** | — |
| Number of ratings | **13** | — |
| Positive reviews | 72.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | — |
| Monetization | Free | — |
| Size | 18 MB | 20 MB |
| Requires iOS | **16.6** | 17.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 9+ | 4+ |
| Developer | [Sang Min Jo](https://appshunter.io/developer/1620771452) | [Yunsu Guk](https://appshunter.io/developer/1348856433) |

## What reviewers say

### IU I

[App page](https://appshunter.io/ios/app/iu-i-ke/id1620771639)

This application synchronizes with IU music videos and content, allowing your official lightstick to be controlled for a personalized concert experience anywhere. Show your support by waving your lightstick in time with the music.

**Highlights:** Lightstick synchronization with music videos, Personalized concert experience, Fan support tool, Online exclusive service

**Features:** Vision Pro support

**In-app purchases:** none


### 4em

[App page](https://appshunter.io/ios/app/4em/id6477289680)

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

**In-app purchases:** none


## Frequently asked questions

### Is IU I free?

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

### Is 4em free?

4em is free to download, with no in-app purchases.

### Do IU I or 4em have ads?

Neither IU I nor 4em shows ads.

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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.*