# Oracle Java SE 21 Developer vs 정보보안기사 필기

The clearest difference is ads: Oracle Java SE 21 Developer at none against 정보보안기사 필기's shown. Oracle Java SE 21 Developer also leads on update cadence (every 4 days vs monthly). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Oracle Java SE 21 Developer sells 1 one-off in-app purchase and 정보보안기사 필기 sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

Oracle Java SE 21 Developer ships an update every 4 days, 정보보안기사 필기 monthly. The most recent releases landed on September 7, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Oracle Java SE 21 Developer | 정보보안기사 필기 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 4 days** | Monthly |
| Size | 201 MB | 84 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CHOI SEONGMIN](https://appshunter.io/developer/6772332527) | [dasong sim](https://appshunter.io/developer/1883683802) |

## What reviewers say

### Oracle Java SE 21 Developer

[App page](https://appshunter.io/ios/app/oracle-java-se-21-developer/id6785110070)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Access | $4.99 | one-time |


### 정보보안기사 필기

[App page](https://appshunter.io/ios/app/id6791809394)

**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 Oracle Java SE 21 Developer free?

Oracle Java SE 21 Developer is free to download, with in-app purchases available.

### Is 정보보안기사 필기 free?

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

### Do Oracle Java SE 21 Developer or 정보보안기사 필기 have ads?

정보보안기사 필기 shows ads; Oracle Java SE 21 Developer does not.

### Which is updated more often, Oracle Java SE 21 Developer or 정보보안기사 필기?

Oracle Java SE 21 Developer ships an update every 4 days, and 정보보안기사 필기 monthly. Most recently, Oracle Java SE 21 Developer was updated on September 7, 2026 and 정보보안기사 필기 on September 10, 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.*