# 유월드기출 vs 산안기

The clearest difference is in-app purchases: 유월드기출 at none against 산안기's 3. 유월드기출 also leads on ads (none vs shown) and update cadence (weekly vs every 3 weeks). On price, device support and iOS requirement there is nothing between them.

Both are free to download. 산안기 sells 3 in-app purchases, starting at $1.99 per month. 유월드기출 asks for nothing beyond the download.

유월드기출 ships an update weekly, 산안기 every 3 weeks. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | 유월드기출 | 산안기 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Weekly** | Every 3 weeks |
| Monetization | — | Free with in-app purchases |
| Size | 50 MB | 91 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [YoungMin Kim](https://appshunter.io/developer/1728974763) | [dasong sim](https://appshunter.io/developer/1883683802) |

## What reviewers say

### 유월드기출

[App page](https://appshunter.io/ios/app/id6747582977)

**Features:** Vision Pro support

**In-app purchases:** none


### 산안기

[App page](https://appshunter.io/ios/app/id6765879972)

This app focuses on effective review and understanding of concepts for the Industrial Safety Engineer exam. It uses an AI-powered algorithm to schedule personalized reviews, identifies your weaknesses, and provides detailed explanations and practice tests. Study efficiently even with limited time.

**Highlights:** AI-powered spaced repetition for optimal review, Concept-based learning with detailed explanations, Personalized weakness analysis and targeted practice, Full-range practice tests simulating the actual exam, Built-in scientific calculator, Offline study support, Progress tracking and study reports

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 프리미엄 월간 | $1.99 | per month |
| 프리미엄 3개월 | $3.99 | per 3 months |
| 프리미엄 평생 | $5.99 | one-time |


## Frequently asked questions

### Is 유월드기출 free?

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

### Is 산안기 free?

산안기 is free to download, with in-app purchases available.

### Do 유월드기출 or 산안기 have ads?

산안기 shows ads; 유월드기출 does not.

### Which is updated more often, 유월드기출 or 산안기?

유월드기출 ships an update weekly, and 산안기 every 3 weeks. Most recently, 유월드기출 was updated on November 5, 2026 and 산안기 on October 31, 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.*