# Diving Express vs PROTREK O2O

The clearest difference is update cadence: PROTREK O2O at every 4 weeks against Diving Express's every 41 months. Diving Express's advantage is iOS requirement (11.0 vs 15.5). 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.

Diving Express ships an update every 41 months, PROTREK O2O every 4 weeks. The most recent releases landed on May 14, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Diving Express | PROTREK O2O |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 41 months | **Every 4 weeks** |
| Size | 44 MB | 56 MB |
| Requires iOS | **11.0** | 15.5 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Chileung Chow](https://appshunter.io/developer/1406124350) | [protrek holdings (hong kong) company limited](https://appshunter.io/developer/1575340472) |

## What reviewers say

### Diving Express

[App page](https://appshunter.io/ios/app/diving-express/id1498011687)

**Features:** macOS Compatibility

**In-app purchases:** none


### PROTREK O2O

[App page](https://appshunter.io/ios/app/protrek-o2o/id1575340470)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Diving Express free?

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

### Is PROTREK O2O free?

PROTREK O2O is free to download, with no in-app purchases.

### Do Diving Express or PROTREK O2O have ads?

Neither Diving Express nor PROTREK O2O shows ads.

### Which is updated more often, Diving Express or PROTREK O2O?

Diving Express ships an update every 41 months, and PROTREK O2O every 4 weeks. Most recently, Diving Express was updated on May 14, 2026 and PROTREK O2O on September 17, 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.*