Nitrox Buddy vs AWU2UDDF
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Nitrox Buddy
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.
- 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
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Nitrox Buddy is a no-frills calculator app for nitrox/enriched air divers - use it to quickly calculate the most important data for your dive: Maximum Operating Depth/MOD, Equivalent Air Depth/EAD, Best Mix and PPO2. The app works with imperial or metric measurements, sea or fresh water, and allows you to select the maximum oxygen content and partial pressure. A companion watch app puts lets you perform all these calculations on your wrist.
AWU2UDDF
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.
- 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
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AWU2UDDF is used to export underwater depth and temperature data collected on your Apple Watch into a standard Universal Dive Data Format (UDDF) XML file. That file can then be imported into standard diving log software such as Macdive or Subsurface to complete your diving log. AWU2UDDF integrates with the Health App and the HealthKit framework to access the depth and temperature date stored by the phone.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Nitrox Buddy | AWU2UDDF |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (468 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 95.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 468 — better | 2 |
| Update frequency | Every 7 months — better | Every 14 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPod, Apple Watch — better | iPhone |
| Requires iOS | 26.0 | 16.0 — better |
| Further details — not scored | ||
| Size | 6 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Gereon Steffens | Douglas Junkins |
Customer experience
Nitrox Buddy
AWU2UDDF
Bugs and requests
Nitrox Buddy
Reported bugs
4 issues- 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
4 requests- 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
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Nitrox Buddy
- Tip$0.99
AWU2UDDF
No in-app purchases
Questions
Is Nitrox Buddy free?
Is AWU2UDDF free?
Which has better reviews, Nitrox Buddy or AWU2UDDF?
Do Nitrox Buddy or AWU2UDDF have ads?
Which is updated more often, Nitrox Buddy or AWU2UDDF?
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