# Dugong vs BJ Co2 Table

The clearest difference is price: Dugong at Free against BJ Co2 Table's $3.99. Dugong also leads on update cadence (every 4 days vs every 3 weeks). BJ Co2 Table's advantage is in-app purchases (none vs 1) and device support (3 vs 1). On ads there is nothing between them.

Dugong is free to download; BJ Co2 Table costs $3.99 up front. Dugong sells 1 one-off in-app purchase. BJ Co2 Table asks for nothing beyond the download.

Dugong ships an update every 4 days, BJ Co2 Table every 3 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Dugong | BJ Co2 Table |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Every 4 days** | Every 3 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 57 MB | 27 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [JaeWon Lee](https://appshunter.io/developer/1831394432) | [jaeyoung park](https://appshunter.io/developer/1878053441) |

## 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 |


### BJ Co2 Table

[App page](https://appshunter.io/ios/app/bj-co2-table/id6759312298)

**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 BJ Co2 Table free?

BJ Co2 Table costs $3.99, with no in-app purchases.

### Do Dugong or BJ Co2 Table have ads?

Both Dugong and BJ Co2 Table show ads.

### Which is updated more often, Dugong or BJ Co2 Table?

Dugong ships an update every 4 days, and BJ Co2 Table every 3 weeks. Most recently, Dugong was updated on October 24, 2026 and BJ Co2 Table on October 25, 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.*