# Charon Express vs Duckling Sort

The clearest difference is in-app purchases: Charon Express at none against Duckling Sort's 5. Charon Express also leads on iOS requirement (15.0 vs 17.0). Duckling Sort's advantage is ads (none vs shown) and update cadence (daily vs every 9 days). On price and device support there is nothing between them.

Both are free to download. Duckling Sort sells 5 in-app purchases, starting at $2.99 per month. Charon Express asks for nothing beyond the download.

Charon Express ships an update every 9 days, Duckling Sort daily. The most recent releases landed on October 24, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Charon Express | Duckling Sort |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 9 days | **Daily** |
| Size | 606 MB | 62 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 9+ | 4+ |
| Developer | [Adisoft Gaming Co., LTD](https://appshunter.io/developer/1774173683) | [Thunyathep Santhanavanich](https://appshunter.io/developer/6811509101) |

## What reviewers say

### Charon Express

[App page](https://appshunter.io/ios/app/charon-express-stack-runner/id6807312752)

**Features:** macOS Compatibility

**In-app purchases:** none


### Duckling Sort

[App page](https://appshunter.io/ios/app/duckling-sort/id6811509098)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Duck Club VIP | $2.99 | per month |
| Coin Pouch | $0.99 | one-time |
| Coin Bag | $2.99 | one-time |
| Coin Bucket | $4.99 | one-time |
| Treasure Chest | $9.99 | one-time |


## Frequently asked questions

### Is Charon Express free?

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

### Is Duckling Sort free?

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

### Do Charon Express or Duckling Sort have ads?

Charon Express shows ads; Duckling Sort does not.

### Which is updated more often, Charon Express or Duckling Sort?

Charon Express ships an update every 9 days, and Duckling Sort daily. Most recently, Charon Express was updated on October 24, 2026 and Duckling Sort on October 26, 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.*