Nitrox Buddy vs NDL
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.
NDL
Confirm your diver or freediver status online and save electronic certificates offline. This app offers a free log-book and No-decompression limit planner, along with the latest news from the National Dive League. Professionals can also manage certificates and access the NDL Professional Zone.
- Confirm diver status online
- Save electronic certificates offline
- Free log-book
- No-decompression limit planner
- Latest news from National Dive League
- Manage certificates for professionals
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The official mobile app from NDL, in which you can confirm your status as a diver or freediver online, and also save electronic certificates offline. Free log-book and No-decompression limit planner. With the help of the application you will receive the latest news from the National Dive League, and professionals will receive a convenient tool for ordering certificates and working with NDL Professional Zone from mobile devices. NDL is diving of the XXI century.
Screenshots
Verdict
The clearest difference is in-app purchases: NDL at none against Nitrox Buddy's 1. NDL also leads on iOS requirement (12.0 vs 26.0). Nitrox Buddy's advantage is review sentiment (96% vs 67%). On price, update cadence, 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. NDL asks for nothing beyond the download.
Nitrox Buddy ships an update every 7 months, NDL every 5 months. The most recent releases landed on October 14, 2026 and September 21, 2026 respectively.
| Parameter | Nitrox Buddy | NDL |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (468 ratings) — better | — |
| Positive reviews | 95.7% of reviews — better | 66.7% of reviews |
| Number of ratings | 468 — better | — |
| Update frequency | Every 7 months | Every 5 months — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPod, Apple Watch — better | iPhone, iPod |
| Requires iOS | 26.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 6 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | Gereon Steffens | NDL, UCH |
Customer experience
Nitrox Buddy
NDL
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)
NDL
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Nitrox Buddy
- Tip$0.99
NDL
No in-app purchases
