Nitrox Buddy vs Octavius
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
Read full descriptionHide full description
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.
Octavius
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.
- Weight calculation for scuba diving
- Optimal buoyancy guidance
- Underwater dive planning
- User-friendly interface
Read full descriptionHide full description
Scuba dive calculator: calculate the proper amount of weight you should carry underwater
Screenshots
Verdict
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.
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. 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.
| Parameter | Nitrox Buddy | Octavius |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (489 ratings) — better | — |
| Positive reviews | 95.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 489 — better | — |
| Update frequency | Every 7 months | Monthly — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, Apple Watch | iPhone, iPad |
| Requires iOS | 26.0 | 16.6 — better |
| Further details — not scored | ||
| Size | 6 MB | 21 MB |
| Age rating | 4+ | 4+ |
| Developer | Gereon Steffens | Yoash Offer |
Customer experience
Nitrox Buddy
Octavius
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)
Octavius
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Nitrox Buddy
- Tip$0.99
Octavius
No in-app purchases
Questions
Is Nitrox Buddy free?
Is Octavius free?
Do Nitrox Buddy or Octavius have ads?
Which is updated more often, Nitrox Buddy or Octavius?
Other comparisons
