# Dugong vs ONYU (온유)

The clearest difference is in-app purchases: ONYU (온유) at none against Dugong's 1. ONYU (온유) also leads on ads (none vs shown) and iOS requirement (15.0 vs 17.0). On price, review sentiment, update cadence and device support there is nothing between them.

Both are free to download. Dugong sells 1 one-off in-app purchase. ONYU (온유) asks for nothing beyond the download.

Dugong ships an update every 4 days, ONYU (온유) every 3 days. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Dugong | ONYU (온유) |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 4 days | **Every 3 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 57 MB | 141 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [JaeWon Lee](https://appshunter.io/developer/1831394432) | [YONGSUK JUN](https://appshunter.io/developer/1890882119) |

## What reviewers say

### Dugong

[App page](https://appshunter.io/ios/app/dugong/id6749602408)

This app helps free divers track their training and log dives. It includes CO2/O2 tables and a dry static training function to improve performance and build a personal dive log.

**Highlights:** CO2/O2 training tables, Dry static training function, Dive logbook creation, Performance tracking, Personalized training

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


### ONYU (온유)

[App page](https://appshunter.io/ios/app/onyu/id6761686451)

This app helps you track your hikes and explore trails with offline GPS, detailed course guides, and safety features. It also fosters a community where users can share their experiences and progress.

**Highlights:** Offline GPS tracking, Detailed course guides, Real-time location sharing, Character progression system, Event participation and certification, Weather alerts, Shareable hike summaries

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

**In-app purchases:** none


## Frequently asked questions

### Is Dugong free?

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

### Is ONYU (온유) free?

ONYU (온유) is free to download, with no in-app purchases.

### Do Dugong or ONYU (온유) have ads?

Dugong shows ads; ONYU (온유) does not.

### Which is updated more often, Dugong or ONYU (온유)?

Dugong ships an update every 4 days, and ONYU (온유) every 3 days. Most recently, Dugong was updated on October 24, 2026 and ONYU (온유) on October 28, 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.*