# Subsurface vs Halcyon Dive Systems

The clearest difference is rating: Halcyon Dive Systems at 5.0 against Subsurface's 4.5. Halcyon Dive Systems also leads on update cadence (every 2 weeks vs every 2 months). Subsurface's advantage is monetization model (free vs ad-supported) and ratings volume (48 vs 8). 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.

Halcyon Dive Systems holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Subsurface has 48 ratings behind it against 8, so its average is the more settled of the two.

Subsurface ships an update every 2 months, Halcyon Dive Systems every 2 weeks. The most recent releases landed on September 18, 2026 and July 24, 2026 respectively.

## The numbers

| Metric | Subsurface | Halcyon Dive Systems |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (48 ratings)](https://appshunter.io/ios/app/subsurface-mobile/id1093217161/reviews) | **[5.0 (8 ratings)](https://appshunter.io/ios/app/halcyon-dive-systems-diving/id6738069654/reviews)** |
| Number of ratings | **48** | 8 |
| Positive reviews | 63.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | **Free** | Ad-supported |
| Size | 52 MB | 159 MB |
| Requires iOS | 17 | **16.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Dirk Hohndel](https://appshunter.io/developer/1093217160) | [Halcyon Dive Systems](https://appshunter.io/developer/1779189368) |

## 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


### Halcyon Dive Systems

[App page](https://appshunter.io/ios/app/halcyon-dive-systems-diving/id6738069654)

This app helps divers log, track, and share their underwater experiences. It offers integration with dive computers, personalized settings, and a community forum for connecting with other divers.

**Highlights:** Symbios integration for dive computer settings, Detailed dive logging and progress tracking, Social logbook for sharing dive stories, Connect with a global diving community, Personalized dive tips and advice, Exclusive benefits for Halcyon owners

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

**In-app purchases:** none


## Frequently asked questions

### Is Subsurface free?

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

### Is Halcyon Dive Systems free?

Halcyon Dive Systems is free to download, with no in-app purchases.

### Which has better reviews, Subsurface or Halcyon Dive Systems?

Halcyon Dive Systems is rated higher. Subsurface averages 4.5 out of 5 from 48 ratings, while Halcyon Dive Systems averages 5.0 from 8 ratings.

### Do Subsurface or Halcyon Dive Systems have ads?

Neither Subsurface nor Halcyon Dive Systems shows ads.

### Which is updated more often, Subsurface or Halcyon Dive Systems?

Subsurface ships an update every 2 months, and Halcyon Dive Systems every 2 weeks. Most recently, Subsurface was updated on September 18, 2026 and Halcyon Dive Systems on July 24, 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.*