# Nitrox Buddy vs AWU2UDDF

The clearest difference is in-app purchases: AWU2UDDF at none against Nitrox Buddy's 1. AWU2UDDF also leads on iOS requirement (16.0 vs 26.0). Nitrox Buddy's advantage is ratings volume (468 vs 2) and device support (3 vs 1). On price, rating, review sentiment and update cadence there is nothing between them.

Both are free to download. Nitrox Buddy sells 1 one-off in-app purchase. AWU2UDDF asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.9 for Nitrox Buddy against 5.0 for AWU2UDDF. That said, the two scores are not equally well evidenced: Nitrox Buddy has 468 ratings behind it against 2, so its average is the more settled of the two. Written reviews are what separate them: 96% of Nitrox Buddy's written reviews are positive against 100% of AWU2UDDF's.

Nitrox Buddy ships an update every 7 months, AWU2UDDF every 14 months. The most recent releases landed on October 14, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Nitrox Buddy | AWU2UDDF |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (468 ratings)](https://appshunter.io/ios/app/nitrox-buddy/id572411073/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/awu2uddf/id1661616210/reviews)** |
| Number of ratings | **468** | 2 |
| Positive reviews | 95.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 7 months** | Every 14 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 6 MB | 1 MB |
| Requires iOS | 26.0 | **16.0** |
| Devices | **iPhone, iPod, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Gereon Steffens](https://appshunter.io/developer/493030228) | [Douglas Junkins](https://appshunter.io/developer/1661616212) |

## What reviewers say

### 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)


### AWU2UDDF

[App page](https://appshunter.io/ios/app/awu2uddf/id1661616210)

Export underwater depth and temperature data from your Apple Watch to a standard UDDF XML file. This file can then be imported into popular diving log software for comprehensive record-keeping. It seamlessly integrates with the Health App and HealthKit.

**Highlights:** Export underwater depth and temperature data, Standard Universal Dive Data Format (UDDF) XML output, Import into Macdive or Subsurface, Integrates with Health App and HealthKit

**In-app purchases:** none


## Frequently asked questions

### Is Nitrox Buddy free?

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

### Is AWU2UDDF free?

AWU2UDDF is free to download, with no in-app purchases.

### Which has better reviews, Nitrox Buddy or AWU2UDDF?

AWU2UDDF is rated higher. Nitrox Buddy averages 4.9 out of 5 from 468 ratings, while AWU2UDDF averages 5.0 from 2 ratings.

### Do Nitrox Buddy or AWU2UDDF have ads?

Neither Nitrox Buddy nor AWU2UDDF shows ads.

### Which is updated more often, Nitrox Buddy or AWU2UDDF?

Nitrox Buddy ships an update every 7 months, and AWU2UDDF every 14 months. Most recently, Nitrox Buddy was updated on October 14, 2026 and AWU2UDDF on September 20, 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.*