The Mares app - Everything you need to dive, in the palm of your hand!
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 As soon as it is outdated, you will receive a message regarding the newest firmware to download.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
I like the way I can see the compass heading while diving
Developer Response
Hi. If you are having issues feel free to contact us directly for help. Best is through the feedback button in the app or at you can also email at contact@mares.com
A proper dive computer for Apple Watch Ultra
OceanWave2026
I am an experienced recreational diver and have done over 700 dives. In Dec 25, I used the Mares App on my Apple Watch Ultra 2 as a secondary dive computer alongside my Suunto EON Core for a 10-dive trip in Cozumel, Mexico, and it genuinely impressed me.Setup was fast and intuitive: Nitrox (32%), gradient factors, alarms and basic configuration were all quick to enter, and once underwater it behaved exactly like a real dive computer should. Depth, NDL, ascent rate, alarms and surface data all tracked accurately, and the dive profiles matched very closely with my Suunto.Where this app really stands out is post-dive logging.It automatically logged my dive sites (Santa Rosa Wall, Tormentos Reef, Cedral Wall, San Clemente, Palancar Gardens, etc), complete with depth profiles, heart rate, temperature, gradient factors and clean charts. The maps and site tagging worked flawlessly, and syncing back to the iphone was stable and fast.After years of half-baked Apple Watch dive apps, this finally feels like a serious dive product built by a real dive manufacturer rather than a fitness app pretending to be a dive computer.I took the 3-day trial and subscribed before the trip was over. I now trust it as a genuine backup dive computer, and for many recreational dives it could easily be used as primary.Highly recommended for any Apple Watch Ultra diver.
Dangerous
Continuity1978
I wanted to give this a try as an alternative to the Oceanic+ app to use my Apple Watch as a dive computer. In short, it’s not yet ready for use. Problems included: 1. It did not actually automatically start at the start of the dive (yes, I’d swapped auto-start over from Oceanic+), meaning if I’d been relying on this I’d have been without a dive computer for the entire dive and its record of my nitrogen levels would have been wrong for subsequent dives. Manually starting once underwater also failed.2. There were numerous problems with setup - it wouldn’t sync with my phone, the terms and conditions screen crashed repeatedly until I created an account, metrics settings weren’t carried across correctly.3. Some settings are non-sensical, e.g. the lowest depth alarm you can set is 31m. Why is this limited? And why not at least let me set the limit at 40m in line with recreational diving qualifications?I don’t recommend using this app in its current state, save your free trial until they’ve had some time to fix the bugs.
Developer Response
Thank you for your feedback and review.Regarding the bugs you mention could you share details with us. If they are real issues and not operational mistakes we would like to examine your logs and resolve any issues you may have found. You could email us at contact@mares.com
Don't use it to update the firmware, it will brick the computer
ReluctantiPhoneUser
I allowed this software to update the firmware on my Smart Air computer when it prompted me to do so.The firmware download failed at 12% and left the computer in an unusable bootloader state. I've tried to reinstall the fimrware a dozen or so times, but the download always fails at varying percentages of completeness.It's pretty shocking that Mares would release software that renders its dive computers unusable if you make the mistake of trying to use it.
Firmware update improvements
Minor improvements and bug fixes
Version 1.2.13
The developer, Head Watersports S.p.A., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
Identifiers
Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
Location
Diagnostics
Privacy practices may vary based, for example, on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Provider
Head Watersports S.p.A.
Size
250.8 MB
Category
Sports
Compatibility
Requires iOS 16.6 or later.
iPhone Requires iOS 16.6 or later.
iPad Requires iPadOS 16.6 or later.
Mac Requires macOS 13.5 or later and a Mac with Apple M1 chip or later.
