# Nitrox Tools vs myPSS

The clearest difference is price: myPSS at Free against Nitrox Tools's $5.99. Nitrox Tools's advantage is update cadence (every 4 months vs every 42 months) and ratings volume (4 vs 1). On rating, ads, in-app purchases and device support there is nothing between them.

myPSS is free to download; Nitrox Tools costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Nitrox Tools against 5.0 for myPSS. Both are backed by a comparable volume of ratings — 4 and 1 respectively.

Nitrox Tools ships an update every 4 months, myPSS every 42 months. Both last shipped on November 13, 2026.

## The numbers

| Metric | Nitrox Tools | myPSS |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| Rating | [5.0 (4 ratings)](https://appshunter.io/ios/app/nitrox-tools/id284919980/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/mypss/id904666792/reviews) |
| Number of ratings | **4** | 1 |
| Positive reviews | 88.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 42 months |
| Monetization | Paid | **Free** |
| Size | 7 MB | 64 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Greg Mclaughlin](https://appshunter.io/developer/284919983) | [Margherita Aucelli](https://appshunter.io/developer/904666795) |

## What reviewers say

### Nitrox Tools

[App page](https://appshunter.io/ios/app/nitrox-tools/id284919980)

This app provides essential tools for divers to plan and blend enriched air nitrox. It calculates dive parameters like equivalent air depth and maximum operating depth, and supports various blending methods for custom gas mixes. Easily switch between metric and imperial units and save custom settings for frequent use.

**Highlights:** Enriched air nitrox blending, Dive planning calculations, Equivalent Air Depth (EAD), Partial Pressure of Oxygen (PPO2), Maximum Operating Depth (MOD), Save custom mixes and settings, Metric/Imperial unit switching

**Features:** Vision Pro support

**In-app purchases:** none


### myPSS

[App page](https://appshunter.io/ios/app/mypss/id904666792)

This application serves as a dedicated platform for members and instructors of PSS. It provides a centralized hub for information and communication within the PSS community.

**Highlights:** Dedicated platform for PSS members, Dedicated platform for PSS instructors, Centralized information hub, Community communication tool

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Nitrox Tools free?

Nitrox Tools costs $5.99, with no in-app purchases.

### Is myPSS free?

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

### Which has better reviews, Nitrox Tools or myPSS?

Nitrox Tools and myPSS are both rated 5.0 out of 5 on the App Store, from 4 and 1 ratings respectively.

### Do Nitrox Tools or myPSS have ads?

Neither Nitrox Tools nor myPSS shows ads.

### Which is updated more often, Nitrox Tools or myPSS?

Nitrox Tools ships an update every 4 months, and myPSS every 42 months. Most recently, Nitrox Tools was updated on November 13, 2026 and myPSS on November 13, 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.*