# 3 vs Harmony Chack

The clearest difference is in-app purchases: 3 at none against Harmony Chack's 1. Harmony Chack's advantage is ads (none vs shown) and iOS requirement (16.0 vs 18.0). On price, update cadence and device support there is nothing between them.

Both are free to download. Harmony Chack sells 1 one-off in-app purchase. 3 asks for nothing beyond the download.

3 ships an update weekly, Harmony Chack fortnightly. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | 3 | Harmony Chack |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 68.8% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Fortnightly |
| Monetization | Ad-supported | — |
| Size | 243 MB | 34 MB |
| Requires iOS | 18.0 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Katsuma Akamatsu](https://appshunter.io/developer/6784473765) | [Hironori Karube](https://appshunter.io/developer/1880243912) |

## What reviewers say

### 3

[App page](https://appshunter.io/ios/app/3-min-compose-musicline/id6784473763)

Create original songs in just 3 minutes with this intuitive music production and MIDI sequencer app. It offers over 100 instruments and easy editing tools, making songwriting fun for beginners and experienced users alike. Share your creations instantly within the app's community.

**Highlights:** Create music in 3 minutes, Over 100 instruments, Intuitive composition tools, MIDI sequencing, In-app community sharing, Adjust key, tempo, and volume

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

**In-app purchases:** none


### Harmony Chack

[App page](https://appshunter.io/ios/app/harmony-chack/id6803001408)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアム | $0.99 | one-time |


## Frequently asked questions

### Is 3 free?

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

### Is Harmony Chack free?

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

### Do 3 or Harmony Chack have ads?

3 shows ads; Harmony Chack does not.

### Which is updated more often, 3 or Harmony Chack?

3 ships an update weekly, and Harmony Chack fortnightly. Most recently, 3 was updated on November 5, 2026 and Harmony Chack 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.*