Mares App vs AWU2UDDF
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Mares App
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.
- 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
Read full descriptionHide full description
APPLE WATCH ULTRA DIVE COMPUTER Transform your Ultra into a dive computer. Record dives directly on your wrist and sync automatically to the Mares App. (In-app purchase required.) DIGITAL LOGBOOK: Log your Scuba, Freediving, Extended Range and Rebreather (SCR/CCR) dives in seconds via Bluetooth. Easily share your dives via QR code. Add new dives with your device’s GPS and download your dives from selected dive computers (1*). DIVE SITES: With the help of the Mares dive site database, you can immediately assign a dive site to your logged dives. You can also add your own private dive sites and share them with your dive buddies using a QR code. You can download your dive data directly from selected Mares dive computers . WILDLIFE: A variety of local wildlife is already stored in the app for individual dive sites. This means you can immediately assign the highlights of your underwater encounters to your logged dives. Your sightings are displayed on your personal world map. DIVE BUDDIES: Easily add your dive buddies via QR code or manually in the app. Share your best dives and most exciting animal encounters with friends using the Mares app. STATISTICS: All your dives and data can be seen at a glance, including your longest or deepest dive, your average dive time and more! DIGITAL EQUIPMENT: Store important dive equipment details, including serial numbers, photos and invoices. Enter maintenance dates and keep track of when your equipment needs to be serviced. NEWS AND VIDEOS: Stay up-to-date with all the latest news and videos from the world of water sports and diving. FIRMWARE: When you connect your dive computer to the app, you will be able to confirm if you have the latest firmware. As soon as it is outdated, you will receive a message regarding the newest firmware to download. TABLES: Here you will find useful information such as decompression tables and emergency scenarios. 1* Currently available for MARES Sirius, Sirius L, Sirius Hunter, Horizon, Genius, Quad CI, Quad 2, Quad Air, Quad, Puck 4, Puck Pro EZ, Puck lite, Puck Pro, Puck Pro Plus, Puck Air 2, Smart, Smart Apnea, Smart Air Terms of Use (EULA) Mares App for Apple Watch Ultra: https://my.divessi.com/published/viewhls/awu_terms_v1/2
AWU2UDDF
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.
- 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
Read full descriptionHide full description
AWU2UDDF is used to export underwater depth and temperature data collected on your Apple Watch into a standard Universal Dive Data Format (UDDF) XML file. That file can then be imported into standard diving log software such as Macdive or Subsurface to complete your diving log. AWU2UDDF integrates with the Health App and the HealthKit framework to access the depth and temperature date stored by the phone.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Mares App | AWU2UDDF |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (183 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 47.5% of reviews | 100.0% of reviews — better |
| Number of ratings | 183 — better | 2 |
| Update frequency | Every 3 weeks — better | Every 14 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, Apple Watch — better | iPhone |
| Requires iOS | 16.6 | 16.0 — better |
| Further details — not scored | ||
| Size | 247 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Head Watersports S.p.A. | Douglas Junkins |
Customer experience
Mares App
AWU2UDDF
In-app purchases
Mares App
- Snorkel Only$2.991 Month
- Full Featured Month (Housing Only)3 Days trial$6.991 Month
- Full Featured Month (Ultra Only)3 Days trial$6.991 Month
Show 5 moreShow fewer
- MARES Fully Featured Monthly3 Days trial$8.991 Month
- Full Featured Yearly (Housing Only)3 Days trial$49.991 Year
- Full Featured Yearly (Ultra Only)3 Days trial$49.991 Year
- MARES Fully Featured Yearly3 Days trial$69.991 Year
- MARES Fully Featured Yearly Family3 Days trial$119.991 Year
AWU2UDDF
No in-app purchases








