# Trimix Tools vs Nitrox Buddy

The clearest difference is price: Nitrox Buddy at Free against Trimix Tools's $6.99. Nitrox Buddy also leads on ratings volume (468 vs 5). Trimix Tools's advantage is in-app purchases (none vs 1) and iOS requirement (15.6 vs 26.0). On rating, review sentiment, update cadence and ads there is nothing between them.

Nitrox Buddy is free to download; Trimix Tools costs $6.99 up front. Nitrox Buddy sells 1 one-off in-app purchase. Trimix Tools asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Trimix Tools against 4.9 for Nitrox Buddy. That said, the two scores are not equally well evidenced: Nitrox Buddy has 468 ratings behind it against 5, so its average is the more settled of the two. Written reviews are what separate them: 100% of Trimix Tools's written reviews are positive against 96% of Nitrox Buddy's.

Trimix Tools ships an update every 5 months, Nitrox Buddy every 7 months. Both last shipped on October 14, 2026.

## The numbers

| Metric | Trimix Tools | Nitrox Buddy |
| --- | --- | --- |
| Price | $6.99 | **Free** |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/trimix-tools/id289220808/reviews)** | [4.9 (468 ratings)](https://appshunter.io/ios/app/nitrox-buddy/id572411073/reviews) |
| Number of ratings | 5 | **468** |
| Positive reviews | **100.0% of reviews** | 95.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 7 months |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 6 MB | 6 MB |
| Requires iOS | **15.6** | 26.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPod, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Greg Mclaughlin](https://appshunter.io/developer/284919983) | [Gereon Steffens](https://appshunter.io/developer/493030228) |

## 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


### Nitrox Buddy

[App page](https://appshunter.io/ios/app/nitrox-buddy/id572411073)

This application serves as a straightforward calculator for nitrox and enriched air divers. It quickly computes essential dive data such as Maximum Operating Depth (MOD), Equivalent Air Depth (EAD), Best Mix, and Partial Pressure of Oxygen (PPO2). It supports both imperial and metric units and offers a companion watch app for on-the-go calculations.

**Highlights:** Calculate MOD, EAD, Best Mix, PPO2, Imperial and metric unit support, Sea and fresh water options, Selectable max oxygen content, Selectable max partial pressure, Companion watch app

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Tip | $0.99 | one-time |

**What reviewers like**

- 👍 Easy to use
- 🚀 Quick calculations
- ✅ Accurate results
- 💡 Free to use
- 🎯 Essential for Nitrox divers

**What reviewers complain about**

- 📱 Ugly iPad icon
- ⚠️ MOD calculation limited to 40% O2 in older versions
- ⚠️ MOD calculation limited to 50% O2 in older versions
- ⚠️ Needs to work with older iOS versions

**Reported bugs**

- iPad icon is ugly
- MOD limit of 50% O2 despite 100% O2 setting (resolved)
- MOD limit of 40% O2 (older version)
- Does not work with older iOS versions

**Requested features**

- Add MOD 1.5 option
- Allow MOD calculation up to 100% O2 and indicate max exposure duration
- Change color for inappropriate mixes (e.g., 50% at 40m)
- Support older iOS versions (5 & 6)


## Frequently asked questions

### Is Trimix Tools free?

Trimix Tools costs $6.99, with no in-app purchases.

### Is Nitrox Buddy free?

Nitrox Buddy is free to download, with in-app purchases available.

### Which has better reviews, Trimix Tools or Nitrox Buddy?

Trimix Tools is rated higher. Trimix Tools averages 5.0 out of 5 from 5 ratings, while Nitrox Buddy averages 4.9 from 468 ratings.

### Do Trimix Tools or Nitrox Buddy have ads?

Neither Trimix Tools nor Nitrox Buddy shows ads.

### Which is updated more often, Trimix Tools or Nitrox Buddy?

Trimix Tools ships an update every 5 months, and Nitrox Buddy every 7 months. Most recently, Trimix Tools was updated on October 14, 2026 and Nitrox Buddy on October 14, 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.*