# 에스원 모두(MoDU) vs 에어(air)

The clearest difference is review sentiment: 에어(air) at 63% against 에스원 모두(MoDU)'s 14%. 에어(air) also leads on update cadence (every 9 days vs monthly). 에스원 모두(MoDU)'s advantage is monetization model (free vs ad-supported) and iOS requirement (13.0 vs 16.0). 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.

에스원 모두(MoDU) ships an update monthly, 에어(air) every 9 days. The most recent releases landed on September 23, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | 에스원 모두(MoDU) | 에어(air) |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (4 ratings)](https://appshunter.io/ios/app/air/id6478105167/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | 13.6% of reviews | **63.3% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 9 days** |
| Monetization | **Free** | Ad-supported |
| Size | 220 MB | 92 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [S1 Corporation](https://appshunter.io/developer/352726008) | [SK Telecom](https://appshunter.io/developer/329992155) |

## What reviewers say

### 에스원 모두(MoDU)

[App page](https://appshunter.io/ios/app/modu/id6451223244)

Manage your S1 security service contracts, view video feeds, and remotely control security systems. This app allows direct application and setup for various software services.

**Highlights:** Contract information lookup, Remote security system control, Video feed viewing, Software service application, Service setup and configuration

**In-app purchases:** none


### 에어(air)

[App page](https://appshunter.io/ios/app/air/id6478105167)

Manage your mobile plan and earn points effortlessly. Discover personalized plans, enjoy daily point accumulation for discounts and shopping, and access essential services. It uses the SK Telecom network for reliable coverage.

**Highlights:** Personalized mobile plans, Daily point accumulation, Points for discounts and shopping, Essential value-added services, SK Telecom network coverage, In-app roaming signup, Step tracking rewards

**In-app purchases:** none


## Frequently asked questions

### Is 에스원 모두(MoDU) free?

에스원 모두(MoDU) is free to download, with no in-app purchases.

### Is 에어(air) free?

에어(air) is free to download, with no in-app purchases.

### Do 에스원 모두(MoDU) or 에어(air) have ads?

Neither 에스원 모두(MoDU) nor 에어(air) shows ads.

### Which is updated more often, 에스원 모두(MoDU) or 에어(air)?

에스원 모두(MoDU) ships an update monthly, and 에어(air) every 9 days. Most recently, 에스원 모두(MoDU) was updated on September 23, 2026 and 에어(air) on September 22, 2026.

---

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