# Subsurface vs SafetyStop

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

Both are free to download. SafetyStop sells 1 in-app purchase, starting at $4.99 per year. Subsurface asks for nothing beyond the download.

Subsurface ships an update every 2 months, SafetyStop every 2 weeks. Both last shipped on October 6, 2026.

## The numbers

| Metric | Subsurface | SafetyStop |
| --- | --- | --- |
| 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 2 weeks** |
| Monetization | Free | — |
| Size | 52 MB | 29 MB |
| Requires iOS | **17** | 18.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Dirk Hohndel](https://appshunter.io/developer/1093217160) | [Kevin Ross](https://appshunter.io/developer/6799123673) |

## 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


### SafetyStop

[App page](https://appshunter.io/ios/app/safetystop-dive-toolkit/id6799123671)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cloud Sync | $4.99 | per year |


## Frequently asked questions

### Is Subsurface free?

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

### Is SafetyStop free?

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

### Do Subsurface or SafetyStop have ads?

Neither Subsurface nor SafetyStop shows ads.

### Which is updated more often, Subsurface or SafetyStop?

Subsurface ships an update every 2 months, and SafetyStop every 2 weeks. Most recently, Subsurface was updated on October 6, 2026 and SafetyStop on October 6, 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.*