# Alert Diver vs Nitrox Buddy

The clearest difference is review sentiment: Nitrox Buddy at 96% against Alert Diver's 25%. Nitrox Buddy also leads on rating (4.9 vs 4.0) and ratings volume (468 vs 4). Alert Diver's advantage is in-app purchases (none vs 1) and iOS requirement (11.0 vs 26.0). On price, update cadence, ads and monetization model there is nothing between them.

Both are free to download. Nitrox Buddy sells 1 one-off in-app purchase. Alert Diver 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 468 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 25% of Alert Diver's written reviews are positive against 96% of Nitrox Buddy's.

Alert Diver ships an update every 6 months, Nitrox Buddy every 7 months. The most recent releases landed on June 9, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | Alert Diver | Nitrox Buddy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (4 ratings)](https://appshunter.io/ios/app/alert-diver/id480608662/reviews) | **[4.9 (468 ratings)](https://appshunter.io/ios/app/nitrox-buddy/id572411073/reviews)** |
| Number of ratings | 4 | **468** |
| Positive reviews | 25.0% of reviews | **95.7% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 7 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 92 MB | 6 MB |
| Requires iOS | **11.0** | 26.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPod, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Divers Alert Network](https://appshunter.io/developer/1482122935) | [Gereon Steffens](https://appshunter.io/developer/493030228) |

## What reviewers say

### Alert Diver

[App page](https://appshunter.io/ios/app/alert-diver/id480608662)

Explore dive industry insights, research, and safety information. Discover underwater photography, travel destinations, and marine environmental topics. This app provides valuable content for divers and enthusiasts.

**Highlights:** Dive industry research, Medical information, Dive safety guidelines, Underwater photography, Dive travel guides, Marine environmental topics

**Features:** macOS Compatibility

**In-app purchases:** none


### 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)


## Frequently asked questions

### Is Alert Diver free?

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

### Is Nitrox Buddy free?

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

### Which has better reviews, Alert Diver or Nitrox Buddy?

Nitrox Buddy is rated higher. Alert Diver averages 4.0 out of 5 from 4 ratings, while Nitrox Buddy averages 4.9 from 468 ratings.

### Do Alert Diver or Nitrox Buddy have ads?

Neither Alert Diver nor Nitrox Buddy shows ads.

### Which is updated more often, Alert Diver or Nitrox Buddy?

Alert Diver ships an update every 6 months, and Nitrox Buddy every 7 months. Most recently, Alert Diver was updated on June 9, 2026 and Nitrox Buddy on September 25, 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.*