# Subsurface vs Simple Nitrox

The clearest difference is in-app purchases: Subsurface at none against Simple Nitrox's 1. Subsurface also leads on update cadence (every 2 months vs every 29 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Simple Nitrox sells 1 one-off in-app purchase. Subsurface asks for nothing beyond the download.

Subsurface ships an update every 2 months, Simple Nitrox every 29 months. The most recent releases landed on September 18, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | Subsurface | Simple Nitrox |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (48 ratings)](https://appshunter.io/ios/app/subsurface-mobile/id1093217161/reviews)** | — |
| Number of ratings | **48** | — |
| Positive reviews | 63.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 29 months |
| Monetization | Free | — |
| Size | 52 MB | 2 MB |
| Requires iOS | 17 | **16.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Dirk Hohndel](https://appshunter.io/developer/1093217160) | [Simon Chivers](https://appshunter.io/developer/1698955737) |

## What reviewers say

### Subsurface

[App page](https://appshunter.io/ios/app/subsurface-mobile/id1093217161)

This application allows divers to manage their dive logs on their mobile devices. It supports editing dive data and downloading new information from compatible dive computers. Optional cloud synchronization is available for seamless data transfer with desktop versions.

**Highlights:** Mobile dive log management, Edit dive data, Download from Bluetooth LE dive computers, Optional cloud synchronization, Open-source and free

**In-app purchases:** none


### Simple Nitrox

[App page](https://appshunter.io/ios/app/simple-nitrox/id6463395880)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Simple Nitrox Full Access | $0.99 | one-time |


## Frequently asked questions

### Is Subsurface free?

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

### Is Simple Nitrox free?

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

### Do Subsurface or Simple Nitrox have ads?

Neither Subsurface nor Simple Nitrox shows ads.

### Which is updated more often, Subsurface or Simple Nitrox?

Subsurface ships an update every 2 months, and Simple Nitrox every 29 months. Most recently, Subsurface was updated on September 18, 2026 and Simple Nitrox on September 12, 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.*