# Nitrox Buddy vs PSS myCard

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.

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.

## The numbers

| Metric | Nitrox Buddy | PSS myCard |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (490 ratings)](https://appshunter.io/ios/app/nitrox-buddy/id572411073/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/pss-mycard/id1077888722/reviews) |
| Number of ratings | **490** | 1 |
| Positive reviews | **95.8% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 7 months** | Every 8 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 6 MB | 8 MB |
| Requires iOS | 26.0 | **9.0** |
| Devices | iPhone, Apple Watch | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Gereon Steffens](https://appshunter.io/developer/493030228) | [Margherita Aucelli](https://appshunter.io/developer/904666795) |

## 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)


### PSS myCard

[App page](https://appshunter.io/ios/app/pss-mycard/id1077888722)

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.

**Highlights:** Automatic data updating, Secure QR code display, Offline data access, Save to Photo Gallery, Send and print options, Digital patent verification

**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 PSS myCard free?

PSS myCard is free to download, with no in-app purchases.

### Which has better reviews, Nitrox Buddy or PSS myCard?

Nitrox Buddy is rated higher. Nitrox Buddy averages 4.9 out of 5 from 490 ratings, while PSS myCard averages 1.0 from 1 ratings.

### Do Nitrox Buddy or PSS myCard have ads?

Neither Nitrox Buddy nor PSS myCard shows ads.

### Which is updated more often, Nitrox Buddy or PSS myCard?

Nitrox Buddy ships an update every 7 months, and PSS myCard every 8 months. Most recently, Nitrox Buddy was updated on October 24, 2026 and PSS myCard on October 11, 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.*