# Oasis Staff vs Nitrox by Envivia

The clearest difference is in-app purchases: Oasis Staff at none against Nitrox by Envivia's 4. Oasis Staff also leads on iOS requirement (13.0 vs 15.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Nitrox by Envivia sells 4 in-app purchases, starting at $9.99 per year. Oasis Staff asks for nothing beyond the download.

Oasis Staff ships an update monthly, Nitrox by Envivia every 6 weeks. The most recent releases landed on October 7, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Oasis Staff | Nitrox by Envivia |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/nitrox-by-envivia/id1613770132/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 6 weeks |
| Monetization | — | Free with in-app purchases |
| Size | 46 MB | 72 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Groupe Scolaire Oasis](https://appshunter.io/developer/1465875815) | [ENVIVIA](https://appshunter.io/developer/1583628615) |

## What reviewers say

### Oasis Staff

[App page](https://appshunter.io/ios/app/oasis-staff/id1608796441)

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

**In-app purchases:** none


### Nitrox by Envivia

[App page](https://appshunter.io/ios/app/nitrox-by-envivia/id1613770132)

This app is a premium digital guide for Nitrox diving, offering educational content and calculation tools to optimize dives. It helps divers understand oxygen limits, plan dives using gradient factors, and prepare for certification.

**Highlights:** Calculate MOD (Maximum Operating Depth), Manage oxygen partial pressure (PPO₂), Optimize Nitrox dive planning, Understand oxygen-related physiological limits, Prepare for Nitrox certification, Multilingual support

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $9.99 | per year |
| Thank you | $1.99 | one-time |
| Popular | $9.99 | one-time |
| Generous | $49.99 | one-time |


## Frequently asked questions

### Is Oasis Staff free?

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

### Is Nitrox by Envivia free?

Nitrox by Envivia is free to download, with in-app purchases available.

### Do Oasis Staff or Nitrox by Envivia have ads?

Neither Oasis Staff nor Nitrox by Envivia shows ads.

### Which is updated more often, Oasis Staff or Nitrox by Envivia?

Oasis Staff ships an update monthly, and Nitrox by Envivia every 6 weeks. Most recently, Oasis Staff was updated on October 7, 2026 and Nitrox by Envivia on September 20, 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.*