# Nitrox Buddy — Nitrox/Enriched Air Calculator

> Nitrox/enriched air diving calculator for MOD, EAD, Best Mix, and PPO2. (iPhone/iPad app by Gereon Steffens.)

- Source: https://appshunter.io/ios/app/nitrox-buddy/id572411073 (this page in markdown: same URL + `.md`)
- Developer: [Gereon Steffens](https://appshunter.io/developer/493030228)
- Category: Sports, Health & Fitness
- Price: Free with in-app purchases
- Rating: 4.88/5 from 468 App Store ratings · 47 written reviews indexed
- Age rating: 4+
- Requires: iOS 26.0 · 6 MB
- Languages: English, French, German
- Released: 2012-11-03
- Data updated: 2026-08-25
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/nitrox-buddy/id572411073/reviews.md

## What is Nitrox Buddy?

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.

## Key features

- 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

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

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


## What do users think of Nitrox Buddy?

Overall sentiment: positive

**Pros**

- 👍 Easy to use
- 🚀 Quick calculations
- ✅ Accurate results
- 💡 Free to use
- 🎯 Essential for Nitrox divers
- 📱 Simple interface
- 🔄 Reliable and functional
- ✨ Helpful for dive planning
- 💯 Covers all necessary Nitrox calculations
- 👍 Highly recommended
- 🔧 Pragmatic tool
- 🤓 Great for staying sharp
- 👍 Perfect for all Nitrox calculations
- 👍 Double-checks fills
- 👍 Companion for Nitrox divers
- 👍 Fast and easy
- 👍 Great functions
- 👍 Quick calculator
- 👍 Easy to double-check safety
- 👍 Professional Divemaster use
- 👍 User-friendly
- 👍 Good visual and tinkering fun
- 👍 Simplifies math for planning and labels
- 👍 Works exactly as it should
- 👍 Clear user interface
- 👍 Handy for determining depth levels
- 👍 Straightforward
- 👍 User friendly
- 👍 Simple and clear
- 👍 Makes planning easy
- 👍 KISS principle at its best
- 👍 No ads
- 👍 No weird UI
- 👍 Best compared to others
- 👍 Very pleased
- 👍 Simple and clear
- 👍 Super practical
- 👍 Excellent light app

**Cons**

- 📱 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

**Commonly 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

**Most 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)

## Recent user reviews (10 of 47)

All indexed reviews: https://appshunter.io/ios/app/nitrox-buddy/id572411073/reviews.md

### 5/5 — Accurate. Pragmatic.

*2025-10-31, version 2.3.1*

Great tool to stay sharp on EAN diving fundamentals.

### 5/5 — All things Nitrox for divers

*2025-08-23, version 2.3.1*

It’s great - what more can I say!

### 5/5 — Nitrox buddy

*2025-08-04, version 2.3.1*

If you dive nitrox it is a definite must app and I highly recommend it👍

### 5/5 — Great tool, thank you

*2025-01-28, version 2.3.1*

Works perfectly and easy to use

### 5/5 — Brilliant App!

*2024-12-30, version 2.3.1*

Very simple and easy to use. Accessible to all!  Highly recommended.

### 5/5 — Good app

*2024-12-21, version 2.3.1*

Very helpful

### 5/5 — Constant companion

*2024-09-16, version 2.3.1*

If you dive Nitrox in any capacity then this app is one of your best friends. Simple, accurate and easy to use. Plan your dive, verify your parameters or just play around.

### 5/5 — Super appli

*2024-05-24, version 2.3.1*

Super appli

### 5/5 — Can’t believe it’s all free!

*2023-09-23, version 2.3.1*

This app is awesome. Very helpful for nitrox diving.

### 5/5 — Great

*2023-09-23, version 2.3.1*

Quick and easy to use way faster then tables

## Frequently asked questions about Nitrox Buddy

### What does Nitrox Buddy do?

Nitrox Buddy is a calculator app specifically designed for nitrox and enriched air divers. It allows users to quickly determine crucial dive parameters such as Maximum Operating Depth (MOD), Equivalent Air Depth (EAD), Best Mix, and Partial Pressure of Oxygen (PPO2).

### What are the key features of Nitrox Buddy?

Key features include the ability to calculate MOD, EAD, Best Mix, and PPO2. The app supports both imperial and metric measurements, can be used for sea or fresh water, and allows users to select their maximum oxygen content and partial pressure. A companion watch app is also available for wrist-based calculations.

### Is Nitrox Buddy free to use?

The application is free to download and use, with options for in-app purchases. This typically means core functionality is available for free, with additional features or advanced options accessible through purchase.

### What dive conditions can I calculate with this app?

You can calculate dive parameters for various conditions, including both sea and fresh water. The app also allows you to specify whether you are using imperial or metric measurements, and you can select your desired maximum oxygen content and partial pressure for your dive.

### Can I use this app on my smartwatch?

Yes, the app offers a companion watch app. This allows you to perform all the essential nitrox and enriched air calculations directly on your wrist, making it convenient for divers to access critical information during their dives.

## Version history (last 5 releases)

### 2.4 — 2026-06-09

Finally got around to adapting the app to iOS 26

### 2.3.1 — 2023-03-28

This update fixes a small but annoying bug

### 2.3 — 2023-01-30

Some minor UI updates and improved compatibility with iOS 16 / watchOS 9

### 2.2 — 2022-04-24

This update adds a calculator for the partial pressure of O2 - given a depth and a gas mix, what is the PPO2?

### 2.1 — 2021-07-25

This update adds 1.5 bar to the possible values for max PPO2.
Also, warnings for unrealistic/dangerous values in the EAD calculation are now clearer.

## Apps similar to Nitrox Buddy

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [SDI TDI ERDI PFI](https://appshunter.io/ios/app/sdi-tdi-erdi-pfi/id1608231239) | 4.3 (149) | Free | Sports |
| [Diveplanner Tec & Rec](https://appshunter.io/ios/app/diveplanner-tec-and-rec/id1506985833) | 3.1 (7) | Free | Sports |
| [Subsurface-mobile](https://appshunter.io/ios/app/subsurface-mobile/id1093217161) | 4.5 (46) | Free | Sports |
| [Dive Shearwater](https://appshunter.io/ios/app/dive-shearwater/id6751863035) | 1.5 (45) | Free | Sports |
| [Mares App](https://appshunter.io/ios/app/mares-app/id1625641063) | 4.5 (164) | Free | Sports |
| [DiverLog+](https://appshunter.io/ios/app/diverlog-plus/id1294460120) | 2.5 (111) | Free | Sports |

## More apps by Gereon Steffens

- [NRTM](https://appshunter.io/ios/app/nrtm/id695468874)
- [Net Deck](https://appshunter.io/ios/app/net-deck/id865963530)
- [Turn Tracker](https://appshunter.io/ios/app/turn-tracker/id1514943618)

All apps by Gereon Steffens: https://appshunter.io/developer/493030228

## Related topics

[scuba nitrox](https://appshunter.io/ios/topics/scuba-nitrox) · [nitrox buddy](https://appshunter.io/ios/topics/nitrox-buddy) · [tdi sdi](https://appshunter.io/ios/topics/tdi-sdi) · [nitrous](https://appshunter.io/ios/topics/nitrous) · [divers alert network](https://appshunter.io/ios/topics/divers-alert-network) · [sdi tdi erdi pfi](https://appshunter.io/ios/topics/sdi-tdi-erdi-pfi) · [scubapro](https://appshunter.io/ios/topics/scubapro)

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-25.*