# Trimix Tools vs Oxygen Cylinder Autonomy Calc

The clearest difference is price: Oxygen Cylinder Autonomy Calc at Free against Trimix Tools's $6.99. Oxygen Cylinder Autonomy Calc also leads on update cadence (every 2 months vs every 4 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; Trimix Tools costs $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Trimix Tools ships an update every 4 months, Oxygen Cylinder Autonomy Calc every 2 months. The most recent releases landed on November 10, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Trimix Tools | Oxygen Cylinder Autonomy Calc |
| --- | --- | --- |
| Price | $6.99 | **Free** |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/trimix-tools/id289220808/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Paid | — |
| Size | 6 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

### Trimix Tools

[App page](https://appshunter.io/ios/app/trimix-tools/id289220808)

This app provides essential tools for divers to plan and blend Trimix gases. It calculates optimal mixes based on depth, oxygen partial pressure, and equivalent narcotic depth, and supports various cylinder filling scenarios. Calculations are available offline and can be customized with saved settings.

**Highlights:** Trimix blending and planning, Depth and partial pressure calculations, Equivalent Narcotic Depth (END) calculation, Saltwater and freshwater support, Cylinder filling and bleed down calculations, Metric and Imperial system support, Offline functionality, Saved settings and custom mixes

**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 Trimix Tools free?

Trimix Tools costs $6.99, 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 Trimix Tools or Oxygen Cylinder Autonomy Calc have ads?

Neither Trimix Tools nor Oxygen Cylinder Autonomy Calc shows ads.

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

Trimix Tools ships an update every 4 months, and Oxygen Cylinder Autonomy Calc every 2 months. Most recently, Trimix Tools was updated on November 10, 2026 and Oxygen Cylinder Autonomy Calc on November 2, 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.*