# Oxygen Cylinder Autonomy Calc vs O'Dive

The clearest difference is iOS requirement: Oxygen Cylinder Autonomy Calc at 9.2 against O'Dive's 13.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Oxygen Cylinder Autonomy Calc ships an update every 2 months, O'Dive monthly. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Oxygen Cylinder Autonomy Calc | O'Dive |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/odive/id1534593720/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | — | Free |
| Size | 16 MB | 25 MB |
| Requires iOS | **9.2** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [DIGITAL IDEATORS INNOVATIONS SRL](https://appshunter.io/developer/1417180570) | [AZOTH SYSTEMS](https://appshunter.io/developer/1534593722) |

## What reviewers say

### Oxygen Cylinder Autonomy Calc

[App page](https://appshunter.io/ios/app/oxygen-cylinder-autonomy-calc/id1257704597)

**Features:** macOS Compatibility

**In-app purchases:** none


### O'Dive

[App page](https://appshunter.io/ios/app/odive/id1534593720)

This app uses patented acoustic sensor technology to analyze gas microbubbles detected after a dive. It helps divers assess their decompression procedures and improve their safety and practice based on personalized acoustic measurements.

**Highlights:** Acoustic sensor technology, Gas microbubble detection, Personalized decompression analysis, Diving practice improvement, Diving safety enhancement, Sensor control interface

**In-app purchases:** none


## Frequently asked questions

### Is Oxygen Cylinder Autonomy Calc free?

Oxygen Cylinder Autonomy Calc is free to download, with no in-app purchases.

### Is O'Dive free?

O'Dive is free to download, with no in-app purchases.

### Do Oxygen Cylinder Autonomy Calc or O'Dive have ads?

Neither Oxygen Cylinder Autonomy Calc nor O'Dive shows ads.

### Which is updated more often, Oxygen Cylinder Autonomy Calc or O'Dive?

Oxygen Cylinder Autonomy Calc ships an update every 2 months, and O'Dive monthly. Most recently, Oxygen Cylinder Autonomy Calc was updated on November 2, 2026 and O'Dive on November 3, 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.*