# Alert Diver vs Subsurface

The clearest difference is review sentiment: Subsurface at 63% against Alert Diver's 25%. Subsurface also leads on rating (4.5 vs 4.0) and monetization model (free vs free with in-app purchases). Alert Diver's advantage is iOS requirement (11.0 vs 17). On price, ads, in-app purchases and device support there is nothing between them.

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

Subsurface holds the better App Store score, 4.5 against 4.0. That said, the two scores are not equally well evidenced: Subsurface has 48 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 25% of Alert Diver's written reviews are positive against 63% of Subsurface's.

Alert Diver ships an update every 6 months, Subsurface every 2 months. The most recent releases landed on October 5, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Alert Diver | Subsurface |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (4 ratings)](https://appshunter.io/ios/app/alert-diver/id480608662/reviews) | **[4.5 (48 ratings)](https://appshunter.io/ios/app/subsurface-mobile/id1093217161/reviews)** |
| Number of ratings | 4 | **48** |
| Positive reviews | 25.0% of reviews | **63.3% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 months** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 92 MB | 52 MB |
| Requires iOS | **11.0** | 17 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Divers Alert Network](https://appshunter.io/developer/1482122935) | [Dirk Hohndel](https://appshunter.io/developer/1093217160) |

## What reviewers say

### Alert Diver

[App page](https://appshunter.io/ios/app/alert-diver/id480608662)

Explore dive industry insights, research, and safety information. Discover underwater photography, travel destinations, and marine environmental topics. This app provides valuable content for divers and enthusiasts.

**Highlights:** Dive industry research, Medical information, Dive safety guidelines, Underwater photography, Dive travel guides, Marine environmental topics

**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 Alert Diver free?

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

### Is Subsurface free?

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

### Which has better reviews, Alert Diver or Subsurface?

Subsurface is rated higher. Alert Diver averages 4.0 out of 5 from 4 ratings, while Subsurface averages 4.5 from 48 ratings.

### Do Alert Diver or Subsurface have ads?

Neither Alert Diver nor Subsurface shows ads.

### Which is updated more often, Alert Diver or Subsurface?

Alert Diver ships an update every 6 months, and Subsurface every 2 months. Most recently, Alert Diver was updated on October 5, 2026 and Subsurface on October 14, 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.*