Nitrox Buddy vs Dive Calculator
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.
Dive Calculator
This app provides comprehensive scuba diving calculations, including basic, nitrox, and trimix gas mixes. It supports both metric and imperial units, and allows for gas volume and cost calculations for blending and top-ups. Results can be easily copied for documentation.
- Basic, Nitrox, and Trimix calculations
- Gas volume and cost calculations
- Top-up and bleed down mix calculations
- Metric and imperial unit support
- Oxygen narcotic/non-narcotic selection
- Copy results to clipboard
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A wide variety of scuba based calculations for all levels of divers. Basic Calculations Include: -ATA -SAC / RMV rates -Tank volume / Pressure rating -Basic unit conversions Nitrox Calculations Include: -EANx best mix -Integrated top-up and bleed down mix calculations -What if top–up -EANx mix planning Trimix Calculations Include: -Integrated top-up and bleed down mix calculations -What if top–up -Trimix planning -Best Trimix -Heliair All blending and top up pages include gas volume and cost calculations. Trimix gas fill orders can be changed by simply dragging the icons to select the fill order. Oxygen can be selected as narcotic / non-narcotic on the appropriate calculation pages. Results can be copied to the clipboard in a text format for use in E-mails, messages or other forms of documentation. All pages support metric and imperial units. Many pages include both metric and imperial units.
Screenshots
Verdict
The clearest difference is monetization model: Dive Calculator at free against Nitrox Buddy's free with in-app purchases. Dive Calculator also leads on iOS requirement (6.0 vs 26.0). Nitrox Buddy's advantage is rating (4.9 vs 4.6) and ratings volume (468 vs 24). On price, review sentiment, update cadence and ads 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 and Dive Calculator sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
Nitrox Buddy holds the better App Store score, 4.9 against 4.6. That said, the two scores are not equally well evidenced: Nitrox Buddy has 468 ratings behind it against 24, so its average is the more settled of the two. Written reviews complicate that: 96% of Nitrox Buddy's written reviews are positive against 100% of Dive Calculator's, so the app with the better star average is not the one people write more warmly about.
Nitrox Buddy ships an update every 7 months, Dive Calculator every 12 months. The most recent releases landed on September 29, 2026 and June 7, 2026 respectively.
| Parameter | Nitrox Buddy | Dive Calculator |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (468 ratings) — better | 4.6 (24 ratings) |
| Positive reviews | 95.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 468 — better | 24 |
| Update frequency | Every 7 months — better | Every 12 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod |
| Requires iOS | 26.0 | 6.0 — better |
| Further details — not scored | ||
| Size | 6 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Gereon Steffens | Zanthic Automation Inc. |
Customer experience
Nitrox Buddy
Dive Calculator
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)
Dive Calculator
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Nitrox Buddy
- Tip$0.99
Dive Calculator
- EANx Calculations$0.99
- Trimix Calculations$0.99
Questions
Is Nitrox Buddy free?
Is Dive Calculator free?
Which has better reviews, Nitrox Buddy or Dive Calculator?
Do Nitrox Buddy or Dive Calculator have ads?
Which is updated more often, Nitrox Buddy or Dive Calculator?
Other comparisons
