Comparison

Mares App vs AWU2UDDF

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

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
Read 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 As soon as it is outdated, you will receive a message regarding the newest firmware to download.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

About

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.

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
Read 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

Mares App4 screens
AWU2UDDF3 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard7 real differences · 3 level
Mares App versus AWU2UDDF: the parameters behind the verdict, then further details
ParameterMares AppAWU2UDDF
PriceFreeFree
Rating4.5 (183 ratings)5.0 (2 ratings) — better
Positive reviews47.5% of reviews100.0% of reviews — better
Number of ratings183 — better2
Update frequencyEvery 3 weeks — betterEvery 14 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, Apple Watch — betteriPhone
Requires iOS16.616.0 — better
Further details — not scored
Size247 MB1 MB
Age rating4+4+
DeveloperHead Watersports S.p.A.Douglas Junkins

Customer experience

Mares App

All ratings183 ratings
Positive89.6%
Neutral4.9%
Negative5.5%
Written reviews99 reviews
Positive47.5%
Neutral12.1%
Negative40.4%

AWU2UDDF

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

8 purchases

Mares App

Subscriptions8
  • 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 more
  • 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
None

AWU2UDDF

No in-app purchases

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.

Other comparisons