# Scuba Gas Manager vs Subsurface

The clearest difference is iOS requirement: Scuba Gas Manager at 8.0 against Subsurface's 17. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Scuba Gas Manager ships an update every 4 months, Subsurface every 2 months. The most recent releases landed on October 10, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Scuba Gas Manager | Subsurface |
| --- | --- | --- |
| 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 | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | — | Free |
| Size | 2 MB | 52 MB |
| Requires iOS | **8.0** | 17 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [AndyDragon Software](https://appshunter.io/developer/527937615) | [Dirk Hohndel](https://appshunter.io/developer/1093217160) |

## What reviewers say

### Scuba Gas Manager

[App page](https://appshunter.io/ios/app/scuba-gas-manager/id705771572)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Scuba Gas Manager free?

Scuba Gas Manager is free to download, with no in-app purchases.

### Is Subsurface free?

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

### Do Scuba Gas Manager or Subsurface have ads?

Neither Scuba Gas Manager nor Subsurface shows ads.

### Which is updated more often, Scuba Gas Manager or Subsurface?

Scuba Gas Manager ships an update every 4 months, and Subsurface every 2 months. Most recently, Scuba Gas Manager was updated on October 10, 2026 and Subsurface on October 22, 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.*