# 장귀오의 스마트 청음 vs 초견챌린지

The clearest difference is review sentiment: 초견챌린지 at 100% against 장귀오의 스마트 청음's 67%. 초견챌린지 also leads on update cadence (every 2 days vs every 3 months). 장귀오의 스마트 청음's advantage is iOS requirement (7.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

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

장귀오의 스마트 청음 ships an update every 3 months, 초견챌린지 every 2 days. The most recent releases landed on November 2, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | 장귀오의 스마트 청음 | 초견챌린지 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 days** |
| Monetization | Free | — |
| Size | 13 MB | 3 MB |
| Requires iOS | **7.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Naeun Zang](https://appshunter.io/developer/723566520) | [jungwook cho](https://appshunter.io/developer/6791017829) |

## What reviewers say

### 장귀오의 스마트 청음

[App page](https://appshunter.io/ios/app/free/id1077998006)

This app provides ear training exercises for music students. It includes melody dictation with varying levels of complexity and rhythm exercises. Practice by listening and transcribing musical pieces to improve your musical ear.

**Highlights:** Melody dictation exercises (20 songs), Rhythm and meter exercises (25 songs), Transcribe music by listening, Improve musical ear, Digital sheet music preparation

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

**In-app purchases:** none


### 초견챌린지

[App page](https://appshunter.io/ios/app/id6800208649)

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

**In-app purchases:** none


## Frequently asked questions

### Is 장귀오의 스마트 청음 free?

장귀오의 스마트 청음 is free to download, with no in-app purchases.

### Is 초견챌린지 free?

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

### Do 장귀오의 스마트 청음 or 초견챌린지 have ads?

Neither 장귀오의 스마트 청음 nor 초견챌린지 shows ads.

### Which is updated more often, 장귀오의 스마트 청음 or 초견챌린지?

장귀오의 스마트 청음 ships an update every 3 months, and 초견챌린지 every 2 days. Most recently, 장귀오의 스마트 청음 was updated on November 2, 2026 and 초견챌린지 on November 10, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*