# 해커스 ONE vs 공풀

The clearest difference is in-app purchases: 공풀 at none against 해커스 ONE's 4. 공풀 also leads on review sentiment (93% vs 63%). 해커스 ONE's advantage is iOS requirement (15.1 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. 해커스 ONE sells 4 one-off in-app purchases. 공풀 asks for nothing beyond the download.

해커스 ONE ships an update every 2 weeks, 공풀 weekly. Both last shipped on October 18, 2026.

## The numbers

| Metric | 해커스 ONE | 공풀 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.5 (10 ratings)](https://appshunter.io/ios/app/one/id1538534916/reviews)** | — |
| Number of ratings | **10** | — |
| Positive reviews | 62.9% of reviews | **93.3% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Weekly** |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 192 MB | 83 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Champ Study Institute](https://appshunter.io/developer/466747997) | [ST Unitas](https://appshunter.io/developer/414843021) |

## What reviewers say

### 해커스 ONE

[App page](https://appshunter.io/ios/app/one/id1538534916)

Access a wide range of online courses from Hackers in various fields like language, civil service exams, and professional certifications. Enjoy convenient features like personalized course lists, free lectures, and study materials.

**Highlights:** Browse courses by interest, View lecture, textbook, and review info, Access free lectures and study materials, Play lectures directly from 'My Lectures', Organize lectures with DIY features, Utilize notepad and Q&A features, Receive news and share study information

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 왕초보  그림으로 배우는 일본어 회화 | $2.99 | one-time |
| 원어민이 알려주는 리얼 여행영어 - 해외 현지 촬영 | $2.99 | one-time |
| 이유리의 누구나 쉽게 배우는 여행 중국어 (전반부) | $2.99 | one-time |
| 제2외국어 대표강의 - 9강좌 종합 | $30.99 | one-time |


### 공풀

[App page](https://appshunter.io/ios/app/id6743520174)

This app provides a vast collection of past exam questions for civil service exams, allowing users to practice and review anytime, anywhere. It offers various question types, personalized vocabulary lists, and an automatic incorrect answer notebook to help users focus on their weaknesses and improve their study motivation.

**Highlights:** 53,786+ past exam questions, Covers national, local, and military civil service exams, Practice with past questions, variations, and OX quizzes, Focus on key English vocabulary with custom word lists, Automatic incorrect answer notebook, Real-time rankings and missions for motivation

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

**In-app purchases:** none


## Frequently asked questions

### Is 해커스 ONE free?

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

### Is 공풀 free?

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

### Do 해커스 ONE or 공풀 have ads?

Neither 해커스 ONE nor 공풀 shows ads.

### Which is updated more often, 해커스 ONE or 공풀?

해커스 ONE ships an update every 2 weeks, and 공풀 weekly. Most recently, 해커스 ONE was updated on October 18, 2026 and 공풀 on October 18, 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.*