# Nitrox Buddy vs nitroxCalc

The clearest difference is in-app purchases: nitroxCalc at none against Nitrox Buddy's 1. nitroxCalc also leads on iOS requirement (9.0 vs 26.0). Nitrox Buddy's advantage is update cadence (every 7 months vs every 18 months). On price, ads and device support there is nothing between them.

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

Nitrox Buddy ships an update every 7 months, nitroxCalc every 18 months. The most recent releases landed on September 21, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | Nitrox Buddy | nitroxCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (468 ratings)](https://appshunter.io/ios/app/nitrox-buddy/id572411073/reviews)** | — |
| Number of ratings | **468** | — |
| Positive reviews | 95.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 7 months** | Every 18 months |
| Monetization | Free with in-app purchases | — |
| Size | 6 MB | 5 MB |
| Requires iOS | 26.0 | **9.0** |
| Devices | **iPhone, iPod, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Gereon Steffens](https://appshunter.io/developer/493030228) | [CAP-REL](https://appshunter.io/developer/1405536766) |

## 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)


### nitroxCalc

[App page](https://appshunter.io/ios/app/nitroxcalc/id1408060704)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Nitrox Buddy free?

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

### Is nitroxCalc free?

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

### Do Nitrox Buddy or nitroxCalc have ads?

Neither Nitrox Buddy nor nitroxCalc shows ads.

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

Nitrox Buddy ships an update every 7 months, and nitroxCalc every 18 months. Most recently, Nitrox Buddy was updated on September 21, 2026 and nitroxCalc on September 8, 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.*