# USIM스마트인증 vs 써썽

The clearest difference is ads: USIM스마트인증 at none against 써썽's shown. USIM스마트인증 also leads on monetization model (free vs free with in-app purchases). 써썽's advantage is update cadence (every 3 days vs every 4 months) and review sentiment (100% vs 83%). On price, in-app purchases, device support and iOS requirement there is nothing between them.

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

USIM스마트인증 ships an update every 4 months, 써썽 every 3 days. The most recent releases landed on October 29, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | USIM스마트인증 | 써썽 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.8 (4 ratings)](https://appshunter.io/ios/app/usim/id1288412388/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 82.6% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 3 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 50 MB | 56 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [RaonSecure Co., Ltd.](https://appshunter.io/developer/1288412382) | [YONG UN LEE](https://appshunter.io/developer/1841871518) |

## 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


### 써썽

[App page](https://appshunter.io/ios/app/id6773219036)

This app helps you track where your money goes, compare your spending to local averages, and save more effectively. It offers smart spending coaching, easy one-line recording, and collaborative budgeting for couples, families, or roommates.

**Highlights:** Smart spending coaching, Local spending comparison, One-line recording, Shared household budgets, Automatic expense settlement, Multiple budget management, Savings community

**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 써썽 free?

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

### Do USIM스마트인증 or 써썽 have ads?

써썽 shows ads; USIM스마트인증 does not.

### Which is updated more often, USIM스마트인증 or 써썽?

USIM스마트인증 ships an update every 4 months, and 써썽 every 3 days. Most recently, USIM스마트인증 was updated on October 29, 2026 and 써썽 on October 6, 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.*