# Nitrox Tools vs Oxygen Cylinder Autonomy Calc

The clearest difference is price: Oxygen Cylinder Autonomy Calc at Free against Nitrox Tools's $5.99. Oxygen Cylinder Autonomy Calc also leads on update cadence (every 2 months vs every 5 months) and iOS requirement (9.2 vs 15.6). On ads, in-app purchases and device support there is nothing between them.

Oxygen Cylinder Autonomy Calc is free to download; Nitrox Tools costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Nitrox Tools ships an update every 5 months, Oxygen Cylinder Autonomy Calc every 2 months. The most recent releases landed on September 23, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Nitrox Tools | Oxygen Cylinder Autonomy Calc |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/nitrox-tools/id284919980/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 88.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | Paid | — |
| Size | 7 MB | 16 MB |
| Requires iOS | 15.6 | **9.2** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Greg Mclaughlin](https://appshunter.io/developer/284919983) | [DIGITAL IDEATORS INNOVATIONS SRL](https://appshunter.io/developer/1417180570) |

## What reviewers say

### Nitrox Tools

[App page](https://appshunter.io/ios/app/nitrox-tools/id284919980)

This app provides essential tools for divers to plan and blend enriched air nitrox. It calculates dive parameters like equivalent air depth and maximum operating depth, and supports various blending methods for custom gas mixes. Easily switch between metric and imperial units and save custom settings for frequent use.

**Highlights:** Enriched air nitrox blending, Dive planning calculations, Equivalent Air Depth (EAD), Partial Pressure of Oxygen (PPO2), Maximum Operating Depth (MOD), Save custom mixes and settings, Metric/Imperial unit switching

**Features:** Vision Pro support

**In-app purchases:** none


### Oxygen Cylinder Autonomy Calc

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Nitrox Tools free?

Nitrox Tools costs $5.99, with no in-app purchases.

### Is Oxygen Cylinder Autonomy Calc free?

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

### Do Nitrox Tools or Oxygen Cylinder Autonomy Calc have ads?

Neither Nitrox Tools nor Oxygen Cylinder Autonomy Calc shows ads.

### Which is updated more often, Nitrox Tools or Oxygen Cylinder Autonomy Calc?

Nitrox Tools ships an update every 5 months, and Oxygen Cylinder Autonomy Calc every 2 months. Most recently, Nitrox Tools was updated on September 23, 2026 and Oxygen Cylinder Autonomy Calc on September 13, 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.*