# Mares App vs AWU2UDDF

The clearest difference is review sentiment: AWU2UDDF at 100% against Mares App's 47%. AWU2UDDF also leads on rating (5.0 vs 4.5) and in-app purchases (none vs 8). Mares App's advantage is update cadence (every 3 weeks vs every 14 months) and ratings volume (183 vs 2). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Mares App sells 8 in-app purchases, starting at $2.99 per month. AWU2UDDF asks for nothing beyond the download.

AWU2UDDF holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Mares App has 183 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 47% of Mares App's written reviews are positive against 100% of AWU2UDDF's.

Mares App ships an update every 3 weeks, AWU2UDDF every 14 months. The most recent releases landed on September 21, 2026 and September 6, 2026 respectively.

## The numbers

| Metric | Mares App | AWU2UDDF |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (183 ratings)](https://appshunter.io/ios/app/mares-app/id1625641063/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/awu2uddf/id1661616210/reviews)** |
| Number of ratings | **183** | 2 |
| Positive reviews | 47.5% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 14 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 247 MB | 1 MB |
| Requires iOS | 16.6 | **16.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Head Watersports S.p.A.](https://appshunter.io/developer/1193522423) | [Douglas Junkins](https://appshunter.io/developer/1661616212) |

## What reviewers say

### Mares App

[App page](https://appshunter.io/ios/app/mares-app/id1625641063)

Transform your Apple Watch Ultra into a dive computer, recording dives directly on your wrist. Log scuba, freediving, and technical dives, manage dive sites, and track underwater wildlife sightings. Share your adventures with dive buddies and keep your equipment details organized.

**Highlights:** Apple Watch Ultra dive computer integration, Digital dive logbook, Dive site database and management, Underwater wildlife tracking, Dive buddy sharing, Dive equipment management, Firmware updates

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Snorkel Only | $2.99 | per month |
| Full Featured Month (Housing Only) | $6.99 | per month |
| Full Featured Month (Ultra Only) | $6.99 | per month |
| MARES Fully Featured Monthly | $8.99 | per month |
| Full Featured Yearly (Housing Only) | $49.99 | per year |
| Full Featured Yearly (Ultra Only) | $49.99 | per year |
| MARES Fully Featured Yearly | $69.99 | per year |
| MARES Fully Featured Yearly Family | $119.99 | per year |


### 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 Mares App free?

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

### Is AWU2UDDF free?

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

### Which has better reviews, Mares App or AWU2UDDF?

AWU2UDDF is rated higher. Mares App averages 4.5 out of 5 from 183 ratings, while AWU2UDDF averages 5.0 from 2 ratings.

### Do Mares App or AWU2UDDF have ads?

Neither Mares App nor AWU2UDDF shows ads.

### Which is updated more often, Mares App or AWU2UDDF?

Mares App ships an update every 3 weeks, and AWU2UDDF every 14 months. Most recently, Mares App was updated on September 21, 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.*