# 고종훈 OX 문제집(9급 공무원 대비) vs 해피캠퍼스

The clearest difference is review sentiment: 고종훈 OX 문제집(9급 공무원 대비) at 100% against 해피캠퍼스's 0%. 고종훈 OX 문제집(9급 공무원 대비) also leads on in-app purchases (none vs 4) and ads (none vs shown). 해피캠퍼스's advantage is update cadence (every 3 weeks vs every 6 weeks). On price, device support and iOS requirement there is nothing between them.

Both are free to download. 해피캠퍼스 sells 4 one-off in-app purchases. 고종훈 OX 문제집(9급 공무원 대비) asks for nothing beyond the download.

고종훈 OX 문제집(9급 공무원 대비) ships an update every 6 weeks, 해피캠퍼스 every 3 weeks. The most recent releases landed on October 24, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | 고종훈 OX 문제집(9급 공무원 대비) | 해피캠퍼스 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ox-9/id6470810098/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 27 MB | 48 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [NewLearn Soft](https://appshunter.io/developer/1815216881) | [Agentsoft Co., Ltd.](https://appshunter.io/developer/1078532533) |

## What reviewers say

### 고종훈 OX 문제집(9급 공무원 대비)

[App page](https://appshunter.io/ios/app/ox-9/id6470810098)

Prepare for civil service exams with this app. It offers an error correction notebook to save and review incorrect answers, and automatically scores chapters to identify weak areas. The clean interface is designed for comfort during long study sessions.

**Highlights:** Error correction notebook, Review saved incorrect answers, Chapter completion scoring, Identify weak study areas, Comfortable screen layout, Vibration for incorrect answers

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

**In-app purchases:** none

**What reviewers like**

- 👍 Excellent for utilizing spare time
- 👍 Convenient for studying on the go
- 👍 Effective for reviewing and reinforcing knowledge
- 👍 High-quality questions and content
- 👍 User-friendly interface and design

**What reviewers complain about**

- 🐛 Problem numbers sometimes start from 2
- 🐛 Scrolling needed for long explanations
- 🐛 Some users wish for faster app loading
- 🐛 Manually favoriting questions is tedious
- 🐛 Lack of explanations for some questions (mentioned by one user)

**Reported bugs**

- Typo: OECD written as trueECD in Part8-Chapter2-Quiz61 and Part8-Chapter3-Quiz18

**Requested features**

- Ability to move between questions freely (forward/backward)
- Option to collect wrong answers in one go for O답노트
- Ability to upload photos
- Faster app loading speed
- Improvement in favoriting/bookmarking questions


### 해피캠퍼스

[App page](https://appshunter.io/ios/app/id6472879125)

Access a vast library of academic papers, resumes, and study materials for various educational levels. Share your own work and earn money through a peer-to-peer marketplace. Available on both PC and mobile devices.

**Highlights:** Access academic papers and study materials, Upload and sell your own documents, Earn money from shared content, Browse popular topics and case studies, View and download original documents, Cross-platform PC and mobile access

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 10,000코인 충전 | $9.99 | one-time |
| 20,000코인 충전 | $19.99 | one-time |
| 30,000코인 충전 | $29.99 | one-time |
| 50,000코인 충전 | $49.99 | one-time |


## Frequently asked questions

### Is 고종훈 OX 문제집(9급 공무원 대비) free?

고종훈 OX 문제집(9급 공무원 대비) is free to download, with no in-app purchases.

### Is 해피캠퍼스 free?

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

### Do 고종훈 OX 문제집(9급 공무원 대비) or 해피캠퍼스 have ads?

해피캠퍼스 shows ads; 고종훈 OX 문제집(9급 공무원 대비) does not.

### Which is updated more often, 고종훈 OX 문제집(9급 공무원 대비) or 해피캠퍼스?

고종훈 OX 문제집(9급 공무원 대비) ships an update every 6 weeks, and 해피캠퍼스 every 3 weeks. Most recently, 고종훈 OX 문제집(9급 공무원 대비) was updated on October 24, 2026 and 해피캠퍼스 on October 30, 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.*