# USIM스마트인증 vs SGI M(SGI서울보증)

The clearest difference is rating: SGI M(SGI서울보증) at 2.6 against USIM스마트인증's 1.8. SGI M(SGI서울보증) also leads on update cadence (every 2 months vs every 4 months) and iOS requirement (13.0 vs 16.0). USIM스마트인증's advantage is review sentiment (83% vs 52%). On price, ratings volume, ads and in-app purchases there is nothing between them.

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

SGI M(SGI서울보증) holds the better App Store score, 2.6 against 1.8. Both are backed by a comparable volume of ratings — 4 and 5 respectively. Written reviews complicate that: 83% of USIM스마트인증's written reviews are positive against 52% of SGI M(SGI서울보증)'s, so the app with the better star average is not the one people write more warmly about.

USIM스마트인증 ships an update every 4 months, SGI M(SGI서울보증) every 2 months. The most recent releases landed on September 22, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | USIM스마트인증 | SGI M(SGI서울보증) |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.8 (4 ratings)](https://appshunter.io/ios/app/usim/id1288412388/reviews) | **[2.6 (5 ratings)](https://appshunter.io/ios/app/sgi-msgi/id6443694425/reviews)** |
| Number of ratings | 4 | **5** |
| Positive reviews | **82.6% of reviews** | 52.2% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 50 MB | 80 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [RaonSecure Co., Ltd.](https://appshunter.io/developer/1288412382) | [SGI서울보증](https://appshunter.io/developer/638584684) |

## What reviewers say

### USIM스마트인증

[App page](https://appshunter.io/ios/app/usim/id1288412388)

Securely store your digital certificates on your smartphone, eliminating worries about hacking or leaks. Access your certificates easily for logins and financial transactions anytime, anywhere.

**Highlights:** Secure certificate storage on smartphone, Protection against hacking and leaks, Convenient access for logins and transactions, Portable digital certificate management, Use for year-end tax settlement

**Features:** Vision Pro support

**In-app purchases:** none


### SGI M(SGI서울보증)

[App page](https://appshunter.io/ios/app/sgi-msgi/id6443694425)

Manage your insurance contracts conveniently from your smartphone. Offers secure login options and electronic signing for various services, including new online-exclusive product sales. Contact customer service for assistance.

**Highlights:** Insurance contract management, Secure login via financial certificate or phone verification, Quick login with Kakao/Naver, Electronic signing with various certificates, New online-exclusive product sales

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

**In-app purchases:** none


## Frequently asked questions

### Is USIM스마트인증 free?

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

### Is SGI M(SGI서울보증) free?

SGI M(SGI서울보증) is free to download, with no in-app purchases.

### Which has better reviews, USIM스마트인증 or SGI M(SGI서울보증)?

SGI M(SGI서울보증) is rated higher. USIM스마트인증 averages 1.8 out of 5 from 4 ratings, while SGI M(SGI서울보증) averages 2.6 from 5 ratings.

### Do USIM스마트인증 or SGI M(SGI서울보증) have ads?

Neither USIM스마트인증 nor SGI M(SGI서울보증) shows ads.

### Which is updated more often, USIM스마트인증 or SGI M(SGI서울보증)?

USIM스마트인증 ships an update every 4 months, and SGI M(SGI서울보증) every 2 months. Most recently, USIM스마트인증 was updated on September 22, 2026 and SGI M(SGI서울보증) on October 2, 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.*