# Subsurface vs AWU2UDDF

The clearest difference is review sentiment: AWU2UDDF at 100% against Subsurface's 63%. AWU2UDDF also leads on rating (5.0 vs 4.5). Subsurface's advantage is update cadence (every 2 months vs every 14 months) and ratings volume (48 vs 2). On price, ads, in-app purchases and monetization model there is nothing between them.

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

AWU2UDDF 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 2, so its average is the more settled of the two. Written reviews point the same way: 63% of Subsurface's written reviews are positive against 100% of AWU2UDDF's.

Subsurface ships an update every 2 months, AWU2UDDF every 14 months. The most recent releases landed on September 18, 2026 and September 6, 2026 respectively.

## The numbers

| Metric | Subsurface | AWU2UDDF |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (48 ratings)](https://appshunter.io/ios/app/subsurface-mobile/id1093217161/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/awu2uddf/id1661616210/reviews)** |
| Number of ratings | **48** | 2 |
| Positive reviews | 63.3% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 14 months |
| Monetization | Free | Free |
| Size | 52 MB | 1 MB |
| Requires iOS | 17 | **16.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Dirk Hohndel](https://appshunter.io/developer/1093217160) | [Douglas Junkins](https://appshunter.io/developer/1661616212) |

## 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


### AWU2UDDF

[App page](https://appshunter.io/ios/app/awu2uddf/id1661616210)

Export underwater depth and temperature data from your Apple Watch to a standard UDDF XML file. This file can then be imported into popular diving log software for comprehensive record-keeping. It seamlessly integrates with the Health App and HealthKit.

**Highlights:** Export underwater depth and temperature data, Standard Universal Dive Data Format (UDDF) XML output, Import into Macdive or Subsurface, Integrates with Health App and HealthKit

**In-app purchases:** none


## Frequently asked questions

### Is Subsurface free?

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

### Is AWU2UDDF free?

AWU2UDDF is free to download, with no in-app purchases.

### Which has better reviews, Subsurface or AWU2UDDF?

AWU2UDDF is rated higher. Subsurface averages 4.5 out of 5 from 48 ratings, while AWU2UDDF averages 5.0 from 2 ratings.

### Do Subsurface or AWU2UDDF have ads?

Neither Subsurface nor AWU2UDDF shows ads.

### Which is updated more often, Subsurface or AWU2UDDF?

Subsurface ships an update every 2 months, and AWU2UDDF every 14 months. Most recently, Subsurface was updated on September 18, 2026 and AWU2UDDF on September 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.*