# Nitrox Buddy vs Scuba Diving Hand Signals

The clearest difference is review sentiment: Nitrox Buddy at 96% against Scuba Diving Hand Signals's 50%. Nitrox Buddy also leads on price (Free vs $2.99) and rating (4.9 vs 4.0). Scuba Diving Hand Signals's advantage is in-app purchases (none vs 1) and update cadence (every 5 weeks vs every 7 months). On ads and device support there is nothing between them.

Nitrox Buddy is free to download; Scuba Diving Hand Signals costs $2.99 up front. Nitrox Buddy sells 1 one-off in-app purchase. Scuba Diving Hand Signals asks for nothing beyond the download.

Nitrox Buddy holds the better App Store score, 4.9 against 4.0. That said, the two scores are not equally well evidenced: Nitrox Buddy has 490 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 96% of Nitrox Buddy's written reviews are positive against 50% of Scuba Diving Hand Signals's.

Nitrox Buddy ships an update every 7 months, Scuba Diving Hand Signals every 5 weeks. The most recent releases landed on October 24, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Nitrox Buddy | Scuba Diving Hand Signals |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[4.9 (490 ratings)](https://appshunter.io/ios/app/nitrox-buddy/id572411073/reviews)** | [4.0 (5 ratings)](https://appshunter.io/ios/app/scuba-diving-hand-signals/id876565142/reviews) |
| Number of ratings | **490** | 5 |
| Positive reviews | **95.8% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 5 weeks** |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 6 MB | 62 MB |
| Requires iOS | 26.0 | **15.6** |
| Devices | iPhone, Apple Watch | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Gereon Steffens](https://appshunter.io/developer/493030228) | [Lars Behnke](https://appshunter.io/developer/527638156) |

## 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)


### Scuba Diving Hand Signals

[App page](https://appshunter.io/ios/app/scuba-diving-hand-signals/id876565142)

Master underwater communication with a comprehensive guide to over 240 scuba diving hand signals. Learn common, emergency, and wildlife signals with illustrations and animal facts. Track your progress and test your knowledge with an integrated quiz.

**Highlights:** 240+ hand signals illustrated, Signals grouped into 8 categories, Underwater wildlife facts, Learning progress tracking, Integrated quiz, Social media sharing

**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 Scuba Diving Hand Signals free?

Scuba Diving Hand Signals costs $2.99, with no in-app purchases.

### Which has better reviews, Nitrox Buddy or Scuba Diving Hand Signals?

Nitrox Buddy is rated higher. Nitrox Buddy averages 4.9 out of 5 from 490 ratings, while Scuba Diving Hand Signals averages 4.0 from 5 ratings.

### Do Nitrox Buddy or Scuba Diving Hand Signals have ads?

Neither Nitrox Buddy nor Scuba Diving Hand Signals shows ads.

### Which is updated more often, Nitrox Buddy or Scuba Diving Hand Signals?

Nitrox Buddy ships an update every 7 months, and Scuba Diving Hand Signals every 5 weeks. Most recently, Nitrox Buddy was updated on October 24, 2026 and Scuba Diving Hand Signals on October 26, 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.*