# Nitrox Buddy vs Octavius

The clearest difference is in-app purchases: Octavius at none against Nitrox Buddy's 1. Octavius also leads on update cadence (monthly vs every 7 months) and iOS requirement (16.6 vs 26.0). On price, review sentiment, ads and device support there is nothing between them.

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

Nitrox Buddy ships an update every 7 months, Octavius monthly. The most recent releases landed on October 17, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Nitrox Buddy | Octavius |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (489 ratings)](https://appshunter.io/ios/app/nitrox-buddy/id572411073/reviews)** | — |
| Number of ratings | **489** | — |
| Positive reviews | 95.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 7 months | **Monthly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 6 MB | 21 MB |
| Requires iOS | 26.0 | **16.6** |
| Devices | iPhone, Apple Watch | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Gereon Steffens](https://appshunter.io/developer/493030228) | [Yoash Offer](https://appshunter.io/developer/769920342) |

## 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, Apple Watch app, Vision Pro support

**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)


### Octavius

[App page](https://appshunter.io/ios/app/octavius/id1660568386)

This app helps scuba divers calculate the optimal amount of weight needed for safe underwater dives. It provides essential calculations to ensure proper buoyancy and a comfortable diving experience.

**Highlights:** Weight calculation for scuba diving, Optimal buoyancy guidance, Underwater dive planning, User-friendly interface

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Nitrox Buddy free?

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

### Is Octavius free?

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

### Do Nitrox Buddy or Octavius have ads?

Neither Nitrox Buddy nor Octavius shows ads.

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

Nitrox Buddy ships an update every 7 months, and Octavius monthly. Most recently, Nitrox Buddy was updated on October 17, 2026 and Octavius on October 15, 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.*