Alert Diver vs Nitrox Buddy
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Alert Diver
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.
- Dive industry research
- Medical information
- Dive safety guidelines
- Underwater photography
- Dive travel guides
- Marine environmental topics
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Alert Diver magazine, the dive industry’s leading publication, features DAN’s core content of research, education, medical information and dive safety. In addition, Alert Diver showcases underwater photography, dive travel and marine environmental topics. Divers Alert Network (DAN) is a nonprofit, 501(c)(3) dive safety organization. DAN's mission is to help divers in need of emergency medical assistance and to promote dive safety through research, education, products and services. Published quarterly, Alert Diver is a benefit to members of DAN; its companion website, AlertDiver.com, is available to all. If you are a current DAN member (DAN America region), everything offered in this app is included in your membership and free to you!
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.
Screenshots
Verdict
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.
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. 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.
| Parameter | Alert Diver | Nitrox Buddy |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (4 ratings) | 4.9 (468 ratings) — better |
| Positive reviews | 25.0% of reviews | 95.7% of reviews — better |
| Number of ratings | 4 | 468 — better |
| Update frequency | Every 6 months — better | Every 7 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPod, Apple Watch |
| Requires iOS | 11.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 92 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Divers Alert Network | Gereon Steffens |
Customer experience
Alert Diver
Nitrox Buddy
Bugs and requests
Alert Diver
Not enough reviews yet to summarise bugs or 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)
In-app purchases
Alert Diver
No in-app purchases
Nitrox Buddy
- Tip$0.99
Questions
Is Alert Diver free?
Is Nitrox Buddy free?
Which has better reviews, Alert Diver or Nitrox Buddy?
Do Alert Diver or Nitrox Buddy have ads?
Which is updated more often, Alert Diver or Nitrox Buddy?
Other comparisons
