# Nitrox by Envivia vs Deco Room

The clearest difference is in-app purchases: Deco Room at none against Nitrox by Envivia's 4. Deco Room also leads on update cadence (every 3 days vs every 6 weeks). On price, ads, device support and iOS requirement there is nothing between them.

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

Nitrox by Envivia ships an update every 6 weeks, Deco Room every 3 days. The most recent releases landed on October 23, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Nitrox by Envivia | Deco Room |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/nitrox-by-envivia/id1613770132/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 3 days** |
| Monetization | Free with in-app purchases | — |
| Size | 72 MB | 53 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 12+ |
| Developer | [ENVIVIA](https://appshunter.io/developer/1583628615) | [donarun DAS](https://appshunter.io/developer/6783183987) |

## What reviewers say

### 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 |


### Deco Room

[App page](https://appshunter.io/ios/app/deco-room-dive-theory/id6797449565)

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

**In-app purchases:** none


## Frequently asked questions

### Is Nitrox by Envivia free?

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

### Is Deco Room free?

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

### Do Nitrox by Envivia or Deco Room have ads?

Neither Nitrox by Envivia nor Deco Room shows ads.

### Which is updated more often, Nitrox by Envivia or Deco Room?

Nitrox by Envivia ships an update every 6 weeks, and Deco Room every 3 days. Most recently, Nitrox by Envivia was updated on October 23, 2026 and Deco Room on October 25, 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.*