Nitrox Buddy vs PSS myCard
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.
PSS myCard
Manage and display your certifications and qualifications digitally. Access your data offline and share or print it easily. Automatic updates ensure your information is always current.
- Automatic data updating
- Secure QR code display
- Offline data access
- Save to Photo Gallery
- Send and print options
- Digital patent verification
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PSS My card main functions: Automatic data updating Secure QR Offline data Save in Photo Gallery Send and print with a click Thanks to the "PSS-Sync", Mycard update and automatically synchronize your data (patents and qualifications) when there's connectivity and will save them on your phone. You'll use the App Mycard and show your patents even if you are abroad or without internet connectivity. Thanks to the certifications you send just a single click for check-in at the diving center. The verification of the digital patent, ensures the best certificate of qualification and can be done from any PC, smartphone or table
Screenshots
Verdict
The clearest difference is review sentiment: Nitrox Buddy at 96% against PSS myCard's 0%. Nitrox Buddy also leads on rating (4.9 vs 1.0) and ratings volume (490 vs 1). PSS myCard's advantage is in-app purchases (none vs 1) and iOS requirement (9.0 vs 26.0). 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. PSS myCard asks for nothing beyond the download.
Nitrox Buddy holds the better App Store score, 4.9 against 1.0. That said, the two scores are not equally well evidenced: Nitrox Buddy has 490 ratings behind it against 1, 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 0% of PSS myCard's.
Nitrox Buddy ships an update every 7 months, PSS myCard every 8 months. The most recent releases landed on October 24, 2026 and October 11, 2026 respectively.
| Parameter | Nitrox Buddy | PSS myCard |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (490 ratings) — better | 1.0 (1 ratings) |
| Positive reviews | 95.8% of reviews — better | 0.0% of reviews |
| Number of ratings | 490 — better | 1 |
| Update frequency | Every 7 months — better | Every 8 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, Apple Watch | iPhone, iPad, iPod — better |
| Requires iOS | 26.0 | 9.0 — better |
| Further details — not scored | ||
| Size | 6 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Gereon Steffens | Margherita Aucelli |
Customer experience
Nitrox Buddy
PSS myCard
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)
PSS myCard
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Nitrox Buddy
- Tip$0.99
PSS myCard
No in-app purchases
Questions
Is Nitrox Buddy free?
Is PSS myCard free?
Which has better reviews, Nitrox Buddy or PSS myCard?
Do Nitrox Buddy or PSS myCard have ads?
Which is updated more often, Nitrox Buddy or PSS myCard?
Other comparisons
